8mm Spiro Pro wire sets are for street & strip, off road, street rods, and custom cars. 8mm Spiro Pro wires are engineered to deliver superior performance with unsurpassed quality. They are the top choice amongst racers and enthusiasts alike with heat protection up to 600° Fahrenheit and 65,000 volts of dielectric strength.

Custom Wires are designed to replicate your OE wire set. Each wire is cut to length and booted to match OE wires. Lower resistance will get more fire to your spark plugs, increased horsepower and torque, and improved fuel mileage.

• Custom fit for 1977-86 Chevy Small Block HEI applications. Please see applications chart on the product page for complete list of applications.
• Spark Plug Wire Lengths (inches): 8 cylinders - 32, 40, 22, 36, 36, 40, 40, 44, coil not required
• 90°/135° spark plug boot angle
• 8.0mm outer silicone jacket is rated up to 65K volts and heat resistant to 600° Fahrenheit
• Silicone inner core provides heat protection and superior flexibility throughout its lifetime
• 350 ohms per foot
• Highly conductive stainless steel spiral wound core
• Superior RFI / EMI suppression for applications with CD or electronic ignitions, on board computers, stereos or pit radios
• Taylor low profile Silicone Pro Boots
• Double spring lock spark plug terminals

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.

• 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 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