Doug's Headers - D304

Doug's Headers D304 1 5/8" 4-Tube Shorty Header

Doug's Headers D304 1 5/8" 4-Tube Shorty Header

Part Number: D304 / UPC 694342507046
  • Doug's Headers D304 1 5/8" 4-Tube Shorty Header

Product Info
  • 3/8" Thick machined flanges... no warping
  • CNC mandrel bent tubes... accurate fit & better flow
  • Mid length headers provide improved groungd clearance for popular muscle cars and street rods
  • Heavy 16 gauge tubing... longer life
  • Tubes are pre-polished to remove scratches and the header is finished with a Metallic Ceramic Thermal Barrier Coating polished to a high luster appearance offering corrosion and heat resistance up to 1400 degrees

 

 

Applications and Footnotes

Chevrolet - Camaro

    EMISSION       AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
67 - 81 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Does not fit 67-69 Camaro with A/C
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped
Will fit Detroit Speed & Engineering front subframes with rack and pinion steering
Will not fit with Saginaw Close Ratio 825 Steering Box

Chevrolet - Chevelle / Malibu

    EMISSION       AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
64 - 87 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - Chevy II, Nova

    EMISSION       AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
68 - 79 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - El Camino

    EMISSION       AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
64 - 87 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - Monte Carlo

    EMISSION       AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
70 - 87 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - Passenger Car, Wagon

    EMISSION       AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
71 - 94 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Requires removal or modification of locking steering columns if equipped

Oldsmobile - 442, Cutlass, Vista Cruiser Wagon

    EMISSION       AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
78 - 88 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Oldsmobile - Calais

    EMISSION       AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
78 - 84 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Pontiac - Bonneville, Catalina

    EMISSION       AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
82 - 86 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Pontiac - Firebird, T/A ENGINE SWAP

    EMISSION       AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
67 - 81 265-400 CHEVY Y Y Y Y Y N N 1 5/8 3 OVL
Does not fit 67-69 Camaro with A/C
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Requires removal or modification of locking steering columns if equipped
Will fit Detroit Speed & Engineering front subframes with rack and pinion steering
Will not fit with Saginaw Close Ratio 825 Steering Box

Pontiac - Grand Prix

    EMISSION       AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
78 - 87 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

 

 

Applications and Footnotes

Chevrolet - Camaro

YEARS 67 - 81
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Does not fit 67-69 Camaro with A/C
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped
Will fit Detroit Speed & Engineering front subframes with rack and pinion steering
Will not fit with Saginaw Close Ratio 825 Steering Box

Chevrolet - Chevelle / Malibu

YEARS 64 - 87
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - Chevy II, Nova

YEARS 68 - 79
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - El Camino

YEARS 64 - 87
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - Monte Carlo

YEARS 70 - 87
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - Passenger Car, Wagon

YEARS 71 - 94
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Requires removal or modification of locking steering columns if equipped

Oldsmobile - 442, Cutlass, Vista Cruiser Wagon

YEARS 78 - 88
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Oldsmobile - Calais

YEARS 78 - 84
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Pontiac - Bonneville, Catalina

YEARS 82 - 86
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Pontiac - Firebird, T/A ENGINE SWAP

YEARS 67 - 81
ENGINES 265-400 CHEVY
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Does not fit 67-69 Camaro with A/C
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Requires removal or modification of locking steering columns if equipped
Will fit Detroit Speed & Engineering front subframes with rack and pinion steering
Will not fit with Saginaw Close Ratio 825 Steering Box

Pontiac - Grand Prix

YEARS 78 - 87
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

 

 

Key for abbreviations and acronyms
2V Two valve cylinder head
DP Dual Smog Pump (emissions device)
PSIG Pounds Per Square Inch Gauge
3V Three valve cylinder head
E.O. Executive Order
RD Round Port
4V Four valve cylinder head
EGR Exhaust Gas Recirculation (emissions device)
REC Rectangle Port
A/C Air Conditioning
FLR Floor
SAP Same As (cylinder head) Port
AUTO Automatice Transmission
MCTBC Metallic Ceramic Thermal Barrier Coating
SP Single Smog Pump (emissions device)
COL Column shift
OVL Oval Port
STD Standard Transmission
COLL Collector
P/B Power Brakes
T.P.I. Tuned Port Injection
DIA Diameter
P/S Power Steering

 

 

Highlights
  • Doug's Headers D304
  • 3/8" Thick machined flanges... no warping
  • CNC mandrel bent tubes... accurate fit & better flow
  • Mid length headers provide improved groungd clearance for popular muscle cars and street rods
  • Heavy 16 gauge tubing... longer life
  • Tubes are pre-polished to remove scratches and the header is finished with a Metallic Ceramic Thermal Barrier Coating polished to a high luster appearance offering corrosion and heat resistance up to 1400 degrees

Applications and Footnotes

Chevrolet - Camaro
EMISSION AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
67 - 81 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Does not fit 67-69 Camaro with A/C
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped
Will fit Detroit Speed & Engineering front subframes with rack and pinion steering
Will not fit with Saginaw Close Ratio 825 Steering Box

Chevrolet - Chevelle / Malibu
EMISSION AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
64 - 87 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - Chevy II, Nova
EMISSION AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
68 - 79 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - El Camino
EMISSION AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
64 - 87 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - Monte Carlo
EMISSION AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
70 - 87 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - Passenger Car, Wagon
EMISSION AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
71 - 94 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Requires removal or modification of locking steering columns if equipped

Oldsmobile - 442, Cutlass, Vista Cruiser Wagon
EMISSION AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
78 - 88 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Oldsmobile - Calais
EMISSION AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
78 - 84 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Pontiac - Bonneville, Catalina
EMISSION AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
82 - 86 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Pontiac - Firebird, T/A ENGINE SWAP
EMISSION AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
67 - 81 265-400 CHEVY Y Y Y Y Y N N 1 5/8 3 OVL
Does not fit 67-69 Camaro with A/C
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Requires removal or modification of locking steering columns if equipped
Will fit Detroit Speed & Engineering front subframes with rack and pinion steering
Will not fit with Saginaw Close Ratio 825 Steering Box

Pontiac - Grand Prix
EMISSION AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
78 - 87 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Applications and Footnotes

Chevrolet - Camaro
YEARS 67 - 81
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Does not fit 67-69 Camaro with A/C
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped
Will fit Detroit Speed & Engineering front subframes with rack and pinion steering
Will not fit with Saginaw Close Ratio 825 Steering Box

Chevrolet - Chevelle / Malibu
YEARS 64 - 87
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - Chevy II, Nova
YEARS 68 - 79
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - El Camino
YEARS 64 - 87
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - Monte Carlo
YEARS 70 - 87
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - Passenger Car, Wagon
YEARS 71 - 94
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Requires removal or modification of locking steering columns if equipped

Oldsmobile - 442, Cutlass, Vista Cruiser Wagon
YEARS 78 - 88
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Oldsmobile - Calais
YEARS 78 - 84
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Pontiac - Bonneville, Catalina
YEARS 82 - 86
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Pontiac - Firebird, T/A ENGINE SWAP
YEARS 67 - 81
ENGINES 265-400 CHEVY
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Does not fit 67-69 Camaro with A/C
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Requires removal or modification of locking steering columns if equipped
Will fit Detroit Speed & Engineering front subframes with rack and pinion steering
Will not fit with Saginaw Close Ratio 825 Steering Box

Pontiac - Grand Prix
YEARS 78 - 87
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Key for abbreviations and acronyms
2V Two valve cylinder head
DP Dual Smog Pump (emissions device)
PSIG Pounds Per Square Inch Gauge
3V Three valve cylinder head
E.O. Executive Order
RD Round Port
4V Four valve cylinder head
EGR Exhaust Gas Recirculation (emissions device)
REC Rectangle Port
A/C Air Conditioning
FLR Floor
SAP Same As (cylinder head) Port
AUTO Automatice Transmission
MCTBC Metallic Ceramic Thermal Barrier Coating
SP Single Smog Pump (emissions device)
COL Column shift
OVL Oval Port
STD Standard Transmission
COLL Collector
P/B Power Brakes
T.P.I. Tuned Port Injection
DIA Diameter
P/S Power Steering

Emissions Code Key

The application guide above specifies which Emissions Code applies to this part. Doug's Headers uses a voluntary product identification program whereby all mission-sensitive products can be identified by placing numbered labels in product packaging and listing corresponding numeric codes next to each part number. The corresponding numbers and explanations are as follows:

This Product has been granted a California Air Resources Board (CARB) "E.O" (Executive Order) Exemption, or is considered a Direct Replacement or Consolidated Replacement part. It is 50 State Legal when installed on the appropriate vehicle per the Manufacturer Application guide and Installation Instructions

This product is Legal for use on 1974 and older non catalyst equipped vehicles and is considered a "replacement part" per California Air Resources Board regulations, as long as ALL emissions sensitive components are retained, including A.I.R., EGR, Heat Risers etc. Failure to retain any of these components, or use on any 1975 or newer catalytic converter equipped car would render this product Illegal for Street or Off Highway Use in California, or in states that have adopted California Emissions regulations and may only be used for Closed Course Competition.

This product is Not legal for Street or Off Highway use in California or in states that have adopted California Emissions Regulations and is only intended for Closed Course Competition use, except 1965 and Older US manufactured California Certified vehicles, 1967 or older US manufactured Federally Certified vehicles, or 1967 and older Foreign manufactured vehicles which may have any aftermarket add-on or modified part installed as long as the vehicle can still meet the tailpipe emission standards for the year of the vehicle and retain any original or retrofit crankcase control (PCV) devices and NOx device required for the year of the vehicle.

Additional Information

Doug's PASSENGER CAR HEADERS Mid Length Metallic Ceramic Coated Header development and design is complex and requires a substantial amount of time and resources to do the job right! Many manufacturers are unwilling to make the commitment and instead offer compromised headers at lower prices. Doug's will not compromise performance, quality or fit to compete with inferior designs at cheap prices. Every Doug's header is tuned with the proper tube size and length to efficiently remove all the exhaust from each cylinder, reducing pumping losses resulting in a dramatic increases in horsepower and torque. Doug's headers are carefully developed on the vehicles they are intended to fit and are re-checked numerous times during the design and manufacturing process.

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Instruction Manual
Instruction Manual

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Doug's Headers - D304

Doug's Headers D304 1 5/8" 4-Tube Shorty Header

Doug's Headers D304 1 5/8" 4-Tube Shorty Header

Part Number: D304 / UPC 694342507046
$829.95
$829.95

Shipping calculated at checkout.
Part Number: D304 / UPC 694342507046
  • Free shipping on $99+ orders in lower 48 states
  • 90-day return policy
  • We’re here to help! Call us on 909-599-5955
Emissions code

Emissions Code

Continue Reading to Understand Emissions Codes
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Product Info
  • 3/8" Thick machined flanges... no warping
  • CNC mandrel bent tubes... accurate fit & better flow
  • Mid length headers provide improved groungd clearance for popular muscle cars and street rods
  • Heavy 16 gauge tubing... longer life
  • Tubes are pre-polished to remove scratches and the header is finished with a Metallic Ceramic Thermal Barrier Coating polished to a high luster appearance offering corrosion and heat resistance up to 1400 degrees

 

 

Applications and Footnotes

Chevrolet - Camaro

    EMISSION       AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
67 - 81 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Does not fit 67-69 Camaro with A/C
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped
Will fit Detroit Speed & Engineering front subframes with rack and pinion steering
Will not fit with Saginaw Close Ratio 825 Steering Box

Chevrolet - Chevelle / Malibu

    EMISSION       AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
64 - 87 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - Chevy II, Nova

    EMISSION       AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
68 - 79 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - El Camino

    EMISSION       AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
64 - 87 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - Monte Carlo

    EMISSION       AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
70 - 87 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - Passenger Car, Wagon

    EMISSION       AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
71 - 94 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Requires removal or modification of locking steering columns if equipped

Oldsmobile - 442, Cutlass, Vista Cruiser Wagon

    EMISSION       AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
78 - 88 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Oldsmobile - Calais

    EMISSION       AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
78 - 84 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Pontiac - Bonneville, Catalina

    EMISSION       AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
82 - 86 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Pontiac - Firebird, T/A ENGINE SWAP

    EMISSION       AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
67 - 81 265-400 CHEVY Y Y Y Y Y N N 1 5/8 3 OVL
Does not fit 67-69 Camaro with A/C
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Requires removal or modification of locking steering columns if equipped
Will fit Detroit Speed & Engineering front subframes with rack and pinion steering
Will not fit with Saginaw Close Ratio 825 Steering Box

Pontiac - Grand Prix

    EMISSION       AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
78 - 87 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

 

 

Applications and Footnotes

Chevrolet - Camaro

YEARS 67 - 81
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Does not fit 67-69 Camaro with A/C
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped
Will fit Detroit Speed & Engineering front subframes with rack and pinion steering
Will not fit with Saginaw Close Ratio 825 Steering Box

Chevrolet - Chevelle / Malibu

YEARS 64 - 87
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - Chevy II, Nova

YEARS 68 - 79
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - El Camino

YEARS 64 - 87
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - Monte Carlo

YEARS 70 - 87
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - Passenger Car, Wagon

YEARS 71 - 94
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Requires removal or modification of locking steering columns if equipped

Oldsmobile - 442, Cutlass, Vista Cruiser Wagon

YEARS 78 - 88
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Oldsmobile - Calais

YEARS 78 - 84
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Pontiac - Bonneville, Catalina

YEARS 82 - 86
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Pontiac - Firebird, T/A ENGINE SWAP

YEARS 67 - 81
ENGINES 265-400 CHEVY
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Does not fit 67-69 Camaro with A/C
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Requires removal or modification of locking steering columns if equipped
Will fit Detroit Speed & Engineering front subframes with rack and pinion steering
Will not fit with Saginaw Close Ratio 825 Steering Box

Pontiac - Grand Prix

YEARS 78 - 87
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

 

 

Key for abbreviations and acronyms
2V Two valve cylinder head
DP Dual Smog Pump (emissions device)
PSIG Pounds Per Square Inch Gauge
3V Three valve cylinder head
E.O. Executive Order
RD Round Port
4V Four valve cylinder head
EGR Exhaust Gas Recirculation (emissions device)
REC Rectangle Port
A/C Air Conditioning
FLR Floor
SAP Same As (cylinder head) Port
AUTO Automatice Transmission
MCTBC Metallic Ceramic Thermal Barrier Coating
SP Single Smog Pump (emissions device)
COL Column shift
OVL Oval Port
STD Standard Transmission
COLL Collector
P/B Power Brakes
T.P.I. Tuned Port Injection
DIA Diameter
P/S Power Steering

 

 

Highlights
  • Doug's Headers D304
  • 3/8" Thick machined flanges... no warping
  • CNC mandrel bent tubes... accurate fit & better flow
  • Mid length headers provide improved groungd clearance for popular muscle cars and street rods
  • Heavy 16 gauge tubing... longer life
  • Tubes are pre-polished to remove scratches and the header is finished with a Metallic Ceramic Thermal Barrier Coating polished to a high luster appearance offering corrosion and heat resistance up to 1400 degrees

Applications and Footnotes

Chevrolet - Camaro
EMISSION AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
67 - 81 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Does not fit 67-69 Camaro with A/C
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped
Will fit Detroit Speed & Engineering front subframes with rack and pinion steering
Will not fit with Saginaw Close Ratio 825 Steering Box

Chevrolet - Chevelle / Malibu
EMISSION AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
64 - 87 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - Chevy II, Nova
EMISSION AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
68 - 79 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - El Camino
EMISSION AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
64 - 87 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - Monte Carlo
EMISSION AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
70 - 87 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - Passenger Car, Wagon
EMISSION AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
71 - 94 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Requires removal or modification of locking steering columns if equipped

Oldsmobile - 442, Cutlass, Vista Cruiser Wagon
EMISSION AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
78 - 88 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Oldsmobile - Calais
EMISSION AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
78 - 84 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Pontiac - Bonneville, Catalina
EMISSION AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
82 - 86 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Pontiac - Firebird, T/A ENGINE SWAP
EMISSION AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
67 - 81 265-400 CHEVY Y Y Y Y Y N N 1 5/8 3 OVL
Does not fit 67-69 Camaro with A/C
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Requires removal or modification of locking steering columns if equipped
Will fit Detroit Speed & Engineering front subframes with rack and pinion steering
Will not fit with Saginaw Close Ratio 825 Steering Box

Pontiac - Grand Prix
EMISSION AUTO STD TUBE COLLECTOR PORT
YEARS ENGINES CODE A/C P/B P/S COL FLR COL FLR SIZE (in.) SIZE (in.) SHAPE
78 - 87 265-400 Y Y Y Y Y N N 1 5/8 3 OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Applications and Footnotes

Chevrolet - Camaro
YEARS 67 - 81
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Does not fit 67-69 Camaro with A/C
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped
Will fit Detroit Speed & Engineering front subframes with rack and pinion steering
Will not fit with Saginaw Close Ratio 825 Steering Box

Chevrolet - Chevelle / Malibu
YEARS 64 - 87
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - Chevy II, Nova
YEARS 68 - 79
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - El Camino
YEARS 64 - 87
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - Monte Carlo
YEARS 70 - 87
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Chevrolet - Passenger Car, Wagon
YEARS 71 - 94
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Requires removal or modification of locking steering columns if equipped

Oldsmobile - 442, Cutlass, Vista Cruiser Wagon
YEARS 78 - 88
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Oldsmobile - Calais
YEARS 78 - 84
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Pontiac - Bonneville, Catalina
YEARS 82 - 86
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Pontiac - Firebird, T/A ENGINE SWAP
YEARS 67 - 81
ENGINES 265-400 CHEVY
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Does not fit 67-69 Camaro with A/C
Fits D-Port cylinder heads including ZZ4 crate engines
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Requires removal or modification of locking steering columns if equipped
Will fit Detroit Speed & Engineering front subframes with rack and pinion steering
Will not fit with Saginaw Close Ratio 825 Steering Box

Pontiac - Grand Prix
YEARS 78 - 87
ENGINES 265-400
EMISSION CODE
A/C Y
P/B Y
P/S Y
AUTO COL Y
AUTO FLR Y
STD COL N
STD FLR N
TUBE SIZE (in.) 1 5/8
COLLECTOR SIZE (in.) 3
PORT SHAPE OVL
Fits D-Port cylinder heads including ZZ4 crate engines
Fits factory installed Chevrolet 267, 305, 350 engines.
Fits most angle plug heads
Installation requires left side A/C bracket part number H7608.1979 and later vehicles with short compressors can use the stock bracket.
Mid length design for maximum ground clearance
Must use non-shell type motor mounts
Requires removal or modification of locking steering columns if equipped

Key for abbreviations and acronyms
2V Two valve cylinder head
DP Dual Smog Pump (emissions device)
PSIG Pounds Per Square Inch Gauge
3V Three valve cylinder head
E.O. Executive Order
RD Round Port
4V Four valve cylinder head
EGR Exhaust Gas Recirculation (emissions device)
REC Rectangle Port
A/C Air Conditioning
FLR Floor
SAP Same As (cylinder head) Port
AUTO Automatice Transmission
MCTBC Metallic Ceramic Thermal Barrier Coating
SP Single Smog Pump (emissions device)
COL Column shift
OVL Oval Port
STD Standard Transmission
COLL Collector
P/B Power Brakes
T.P.I. Tuned Port Injection
DIA Diameter
P/S Power Steering

Emissions Code Key

The application guide above specifies which Emissions Code applies to this part. Doug's Headers uses a voluntary product identification program whereby all mission-sensitive products can be identified by placing numbered labels in product packaging and listing corresponding numeric codes next to each part number. The corresponding numbers and explanations are as follows:

This Product has been granted a California Air Resources Board (CARB) "E.O" (Executive Order) Exemption, or is considered a Direct Replacement or Consolidated Replacement part. It is 50 State Legal when installed on the appropriate vehicle per the Manufacturer Application guide and Installation Instructions

This product is Legal for use on 1974 and older non catalyst equipped vehicles and is considered a "replacement part" per California Air Resources Board regulations, as long as ALL emissions sensitive components are retained, including A.I.R., EGR, Heat Risers etc. Failure to retain any of these components, or use on any 1975 or newer catalytic converter equipped car would render this product Illegal for Street or Off Highway Use in California, or in states that have adopted California Emissions regulations and may only be used for Closed Course Competition.

This product is Not legal for Street or Off Highway use in California or in states that have adopted California Emissions Regulations and is only intended for Closed Course Competition use, except 1965 and Older US manufactured California Certified vehicles, 1967 or older US manufactured Federally Certified vehicles, or 1967 and older Foreign manufactured vehicles which may have any aftermarket add-on or modified part installed as long as the vehicle can still meet the tailpipe emission standards for the year of the vehicle and retain any original or retrofit crankcase control (PCV) devices and NOx device required for the year of the vehicle.

Additional Information

Doug's PASSENGER CAR HEADERS Mid Length Metallic Ceramic Coated Header development and design is complex and requires a substantial amount of time and resources to do the job right! Many manufacturers are unwilling to make the commitment and instead offer compromised headers at lower prices. Doug's will not compromise performance, quality or fit to compete with inferior designs at cheap prices. Every Doug's header is tuned with the proper tube size and length to efficiently remove all the exhaust from each cylinder, reducing pumping losses resulting in a dramatic increases in horsepower and torque. Doug's headers are carefully developed on the vehicles they are intended to fit and are re-checked numerous times during the design and manufacturing process.

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