Holley 428xxx-519xxx Series 8 Cylinder Ignitor® II Electronic Ignition Conversion - 12 Volt Negative Ground - PerTronix 9HO-181

Holley 428xxx-519xxx Series 8 Cylinder Ignitor® II Electronic Ignition Conversion - 12 Volt Negative Ground - PerTronix 9HO-181

Part Number: 9HO-181
Skip to product information

Features & Benefits

  • Adaptive dwell maintains peak energy throughout the entire RPM range, reducing misfires while improving engine performance.
  • Develops on average 4 times more available energy between 3000 and 5000 RPM, and 2 times more available plug voltage.
  • Compensates for inherent electronic delay by adjusting the spark timing throughout the entire RPM range.
  • Synchronized peak current and spark timing reduces heat build-up.
  • Senses startup and develops more energy for quicker, easier starting.
  • Pair with a Flame Thrower Canister Coil for optimal performance
  • Legal in all 50 states and Canada (C.A.R.B. E.O. #D-57-22)

The Ignitor II provides increased starting voltage with adaptive dwell control. Ignitor Module Kits are extremely easy to install and fit into your original distributor to maintain your stock look. No additional ignition box is required keeping a clean look under the hood. Ignitors are available for most distributors that came with mechanical breaker points and will cover AUTOMOTIVE, MARINE, INDUSTRIAL and AGRICULTURE applications


Ignitor Electronic Ignition Conversion Kits have proven themselves in applications ranging from race cars to tractors. It is the number one Electronic Ignition Conversion Kit to replace original mechanical points. A Pertronix Points Conversion kit allows you to run a stock distributor while improving the reliability and performance of your ignition system. The Pertronix Ignitor kits simply bolt to the distributor in place of the points assembly and provides a much more accurate trigger signal. This improves the timing accuracy and prevents ‘points bounce’ at higher rpm. The electronic technology also improves the dwell control to improve the spark output of the coil resulting in a hotter spark at the spark plug. With this dependable, self-contained, maintenance free electronic ignition system you'll never replace your points again.

Specifications

Product Line Ignitor II
Voltage 12
Polarity Negative Ground
Trigger Type Magnetic; Hall Effect
Distributor Fitment Holley
Coil Compability 0.6
Dwell Adaptive
Start Mode Built in Start retard + energy boost
Timing High RPM Timing Correction
Rev Limiter No
Multi-Spark No
SAE Wire Gauge 20 Gauge
Terminal Quantity 2
Terminal Type Ring Terminal
Grade Type Performance

Installation instructions

Instruction Manual
Installation Instructions
Download PDF
Applications

Shipping & Delivery

Our ignition and exhaust products ship from our warehouse in Lenexa, KS. Our normal shipping time is 2-3 business days for in-stock parts.

 Shipping Class Order Value Shipping Cost
UPS Ground $0 - 49.99 $6.99 flat rate
UPS Ground $50 - 108.99 $7.49 flat rate
UPS Ground $109+ Free


  • At this time, PerTronix does not offer expedited shipping options from our website.

  • All packages must be inspected upon receipt for any missing or damaged goods and claims for such must be made within 7 days of receipt.

  • PerTronix does not currently ship our products internationally from our web store. For international orders call 909-599-5955 or connect with us here.

  • Once an item has tracking info, it cannot be cancelled. If you decide you don’t want the items after shipment, please take receipt of the item and process it via our return policy. Thank you for understanding!

Returns, Replacements & Warranty

Returns at Pertronix are accepted within 90 days of purchase with prior authorization, ensuring items are in new, resalable condition. To initiate a return, call for an RGA and follow provided instructions. Customers are responsible for return shipping, using a trackable method.

Refunds exclude initial shipping and handling fees and may be subject to a restocking fee. For defective or damaged items, contact Pertronix directly. We are not responsible for user-initiated damage/loss of parts.

For complete details, visit our Returns page.

Warranty

Limited Warranty for Pertronix Products for the United States of America

PerTronix, LLC (for the Pertronix, Taylor, Doug’s, JBA, Patriot, Compu-Fire, and Spyke branded products) warrant to the original end user purchaser in the United States that the Pertronix, Taylor, Doug’s, JBA, Patriot, Compu-Fire, and Spyke branded products (“Product(s)”) shall be free from defects in material and workmanship for the warranty durations set forth in the chart below from the date of purchase or delivery, whichever is later.

 Products Warranty Duration
  • PerTronix Ignitor, Ignitor II and Ignitor III products(Ignition Conversion Kits and Distributors with Ignitor technology included)
  • All JBA Performance Exhaust products
  • All Doug's Headers products
2 years
  • All other PerTronix products
  • All Patriot Exhaust products
  • All Taylor Cable products
  • All Compu-Fire products
  • All Spyke products
1 year

 

Because PerTronix, LLC (collectively, the “Company”) cannot control the quality of products sold by unauthorized sellers, this warranty applies only to Products that were purchased from the Company or the Company’s authorized sellers in the United States, unless otherwise prohibited by law. Company reserves the right to reject warranty claims for Products purchased from unauthorized sellers, including unauthorized Internet sites.

This warranty does not cover any defects due to normal wear and tear, damage due to misuse, alteration to the product, negligence, damage caused by aftermarket applied coatings, discoloration, or corrosion of finished surfaces. This warranty also does not cover damage resulting from collision, improper installation, off-road use, road hazards, the use of exhaust insulating wrap or like products, or rust occurring after installation.

Purchasers of a Product who wish to make a warranty claim based upon an alleged Product defect should email the Company at techs@pertronix.com (for PerTronix products) the following information: (1) Product subject to the claim, (2) brief description of the alleged defect, (3) date and place of purchase/delivery, (4) proof of purchase (showing when and where the Product was purchased), and (5) pictures or videos of the Product. If you purchased on an online marketplace, please be sure the proof of purchase shows from whom you purchased (this information is available in your order history). In some instances, Company may instruct you to mail the Product to Company for inspection and/or repair; if such instruction is provided, Company will provide you with a prepaid shipping label. You can also contact the Company Monday – Friday, 8AM – 6:30PM CT at (913) 808-2376.

Company will replace or repair a defective Product that is covered by this warranty. This
warranty does not cover the cost of removal or installation. Company will pay for the return shipping of the Product to the purchaser.

There are no warranties which extend beyond those stated herein. ANY IMPLIED
WARRANTIES THAT MAY BE APPLICABLE TO PRODUCTS, INCLUDING IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE
LIMITED IN DURATION TO THE DURATION OF THIS WARRANTY. Some States do not
allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you.

UNDER NO CIRCUMSTANCES SHALL THE COMPANY BE LIABLE FOR ANY SPECIAL,
INCIDENTAL, OR CONSEQUENTIAL DAMAGES BASED UPON BREACH OF THIS LIMITED
WARRANTY, BREACH OF CONTRACT OR STRICT LIABILITY. Some States do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you.

This warranty gives you specific legal rights, and you may also have other rights which vary from State to State.

If you have any questions about whether a seller is authorized, please contact us at (913) 808-2376.

This warranty supersedes any warranties stated in product manuals or other written materials.

Effective Date: March 16, 2026

Reviews

Holley 428xxx-519xxx Series 8 Cylinder Ignitor® II Electronic Ignition Conversion - 12 Volt Negative Ground - PerTronix 9HO-181

Holley 428xxx-519xxx Series 8 Cylinder Ignitor® II Electronic Ignition Conversion - 12 Volt Negative Ground - PerTronix 9HO-181

Part Number: 9HO-181
Regular price $231.68
Sale price $231.68 Regular price Save %

Sale Out of Stock
Part Number: 9HO-181
Does This part fit My vehicle?

Year Make Model confirms fitment if you have an OE distributor. If you do not have a OE distributor, please verify your fitment against the distributor list below.

Product details
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  • Affirm

Need help? Call us at 909-599-5955

Emissions code

EMISSIONS CODE

What does this emissions code mean?

  • Free shipping on $99+ orders in lower 48 states
  • 90-day return policy
  • We’re here to help! Call us on 909-599-5955

C.A.R.B. EO Number: D-57-22

View full details

Features & Benefits

  • Adaptive dwell maintains peak energy throughout the entire RPM range, reducing misfires while improving engine performance.
  • Develops on average 4 times more available energy between 3000 and 5000 RPM, and 2 times more available plug voltage.
  • Compensates for inherent electronic delay by adjusting the spark timing throughout the entire RPM range.
  • Synchronized peak current and spark timing reduces heat build-up.
  • Senses startup and develops more energy for quicker, easier starting.
  • Pair with a Flame Thrower Canister Coil for optimal performance
  • Legal in all 50 states and Canada (C.A.R.B. E.O. #D-57-22)

The Ignitor II provides increased starting voltage with adaptive dwell control. Ignitor Module Kits are extremely easy to install and fit into your original distributor to maintain your stock look. No additional ignition box is required keeping a clean look under the hood. Ignitors are available for most distributors that came with mechanical breaker points and will cover AUTOMOTIVE, MARINE, INDUSTRIAL and AGRICULTURE applications


Ignitor Electronic Ignition Conversion Kits have proven themselves in applications ranging from race cars to tractors. It is the number one Electronic Ignition Conversion Kit to replace original mechanical points. A Pertronix Points Conversion kit allows you to run a stock distributor while improving the reliability and performance of your ignition system. The Pertronix Ignitor kits simply bolt to the distributor in place of the points assembly and provides a much more accurate trigger signal. This improves the timing accuracy and prevents ‘points bounce’ at higher rpm. The electronic technology also improves the dwell control to improve the spark output of the coil resulting in a hotter spark at the spark plug. With this dependable, self-contained, maintenance free electronic ignition system you'll never replace your points again.

Specifications

Product Line Ignitor II
Voltage 12
Polarity Negative Ground
Trigger Type Magnetic; Hall Effect
Distributor Fitment Holley
Coil Compability 0.6
Dwell Adaptive
Start Mode Built in Start retard + energy boost
Timing High RPM Timing Correction
Rev Limiter No
Multi-Spark No
SAE Wire Gauge 20 Gauge
Terminal Quantity 2
Terminal Type Ring Terminal
Grade Type Performance

Installation instructions

Instruction Manual
Installation Instructions
Download PDF
Applications

Shipping & Delivery

Our ignition and exhaust products ship from our warehouse in Lenexa, KS. Our normal shipping time is 2-3 business days for in-stock parts.

 Shipping Class Order Value Shipping Cost
UPS Ground $0 - 49.99 $6.99 flat rate
UPS Ground $50 - 108.99 $7.49 flat rate
UPS Ground $109+ Free


  • At this time, PerTronix does not offer expedited shipping options from our website.

  • All packages must be inspected upon receipt for any missing or damaged goods and claims for such must be made within 7 days of receipt.

  • PerTronix does not currently ship our products internationally from our web store. For international orders call 909-599-5955 or connect with us here.

  • Once an item has tracking info, it cannot be cancelled. If you decide you don’t want the items after shipment, please take receipt of the item and process it via our return policy. Thank you for understanding!

Returns, Replacements & Warranty

Returns at Pertronix are accepted within 90 days of purchase with prior authorization, ensuring items are in new, resalable condition. To initiate a return, call for an RGA and follow provided instructions. Customers are responsible for return shipping, using a trackable method.

Refunds exclude initial shipping and handling fees and may be subject to a restocking fee. For defective or damaged items, contact Pertronix directly. We are not responsible for user-initiated damage/loss of parts.

For complete details, visit our Returns page.

Warranty

Limited Warranty for Pertronix Products for the United States of America

PerTronix, LLC (for the Pertronix, Taylor, Doug’s, JBA, Patriot, Compu-Fire, and Spyke branded products) warrant to the original end user purchaser in the United States that the Pertronix, Taylor, Doug’s, JBA, Patriot, Compu-Fire, and Spyke branded products (“Product(s)”) shall be free from defects in material and workmanship for the warranty durations set forth in the chart below from the date of purchase or delivery, whichever is later.

 Products Warranty Duration
  • PerTronix Ignitor, Ignitor II and Ignitor III products(Ignition Conversion Kits and Distributors with Ignitor technology included)
  • All JBA Performance Exhaust products
  • All Doug's Headers products
2 years
  • All other PerTronix products
  • All Patriot Exhaust products
  • All Taylor Cable products
  • All Compu-Fire products
  • All Spyke products
1 year

 

Because PerTronix, LLC (collectively, the “Company”) cannot control the quality of products sold by unauthorized sellers, this warranty applies only to Products that were purchased from the Company or the Company’s authorized sellers in the United States, unless otherwise prohibited by law. Company reserves the right to reject warranty claims for Products purchased from unauthorized sellers, including unauthorized Internet sites.

This warranty does not cover any defects due to normal wear and tear, damage due to misuse, alteration to the product, negligence, damage caused by aftermarket applied coatings, discoloration, or corrosion of finished surfaces. This warranty also does not cover damage resulting from collision, improper installation, off-road use, road hazards, the use of exhaust insulating wrap or like products, or rust occurring after installation.

Purchasers of a Product who wish to make a warranty claim based upon an alleged Product defect should email the Company at techs@pertronix.com (for PerTronix products) the following information: (1) Product subject to the claim, (2) brief description of the alleged defect, (3) date and place of purchase/delivery, (4) proof of purchase (showing when and where the Product was purchased), and (5) pictures or videos of the Product. If you purchased on an online marketplace, please be sure the proof of purchase shows from whom you purchased (this information is available in your order history). In some instances, Company may instruct you to mail the Product to Company for inspection and/or repair; if such instruction is provided, Company will provide you with a prepaid shipping label. You can also contact the Company Monday – Friday, 8AM – 6:30PM CT at (913) 808-2376.

Company will replace or repair a defective Product that is covered by this warranty. This
warranty does not cover the cost of removal or installation. Company will pay for the return shipping of the Product to the purchaser.

There are no warranties which extend beyond those stated herein. ANY IMPLIED
WARRANTIES THAT MAY BE APPLICABLE TO PRODUCTS, INCLUDING IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE
LIMITED IN DURATION TO THE DURATION OF THIS WARRANTY. Some States do not
allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you.

UNDER NO CIRCUMSTANCES SHALL THE COMPANY BE LIABLE FOR ANY SPECIAL,
INCIDENTAL, OR CONSEQUENTIAL DAMAGES BASED UPON BREACH OF THIS LIMITED
WARRANTY, BREACH OF CONTRACT OR STRICT LIABILITY. Some States do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you.

This warranty gives you specific legal rights, and you may also have other rights which vary from State to State.

If you have any questions about whether a seller is authorized, please contact us at (913) 808-2376.

This warranty supersedes any warranties stated in product manuals or other written materials.

Effective Date: March 16, 2026

Reviews

Holley 428xxx-519xxx Series 8 Cylinder Ignitor® II Electronic Ignition Conversion - 12 Volt Negative Ground - PerTronix 9HO-181
Holley 428xxx-519xxx Series 8 Cylinder Ignitor® II Electronic Ignition Conversion - 12 Volt Negative Ground - PerTronix 9HO-181
Regular price $231.68
Sale price $231.68 Regular price

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Distributor Applications

If you do not see your distributor model, use our Distributor Lookup to find the correct Ignition Conversion.
Distributor Make / Model IHC 428095-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 446916-C91
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Distributor Make / Model IHC 446917-C91
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Distributor Make / Model IHC 446918-C91
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Distributor Make / Model IHC 446920-C91
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Distributor Make / Model IHC 446921-C91
Engine 8 cylinder
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Distributor Make / Model IHC 448195-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 448685-C91
Engine 8 cylinder
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Distributor Make / Model IHC 448686-C91
Engine 8 cylinder
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Distributor Make / Model IHC 461270-C91
Engine 8 cylinder
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Distributor Make / Model IHC 461271-C91
Engine 8 cylinder
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Distributor Make / Model IHC 461272-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 461273-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 463330-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 463331-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 463332-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 463333-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 463334-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 463335-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 463336-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 467034-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 467035-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 467073-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 469648-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 469649-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 469650-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 469668-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 471273-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 472203-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 472908-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 480870-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 481270-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 483423-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 483433-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 483492-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 483493-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 484685-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 491344-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 491351-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 491352-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 491354-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Distributor Make / Model IHC 519861-C91
Engine 8 cylinder
Rotation Clockwise distributors only

Applications

This chart assumes your vehicle has its original factory distributor. If yours has been replaced, check the distributor fitment list above instead.
Year / Make / Model 1976-1977 International Scout II
Engine Type V8
Engine Size(s) Liters: 5.0
Cubic Inches: 304
Notes
  • Factory Electronic Ignition; Negative 12-Volt Polarity; With Holley Hot Gold Box Ignition; OE Distributor Holley

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