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Accel

ACCEL 578C1-6 HP Copper Spark Plug

Part # 578C1-6 Be the first to write a review

Compatible with 3.5L V6 engines -One heat range colder - 6-pack

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ACCEL 578C1-6 HP Copper Spark Plug

Estimated Ship Date: 07/24/2026
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$49.95
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ACCEL HP Spark Plugs are made with a Copper core which is a better conductor than Platinum and Iridium. They deliver a stronger spark especially in high performance applications where high combustion pressures are present. Copper is much better at dissipating heat than other materials which lessens the chance of a misfire. ACCEL HP Spark Plugs are gapable allowing you to open the gap exposing a larger flame kernel or close it if needed for high boost applications. All ACCEL HP Spark Plugs have machine rolled threads allowing for a more precise thread engagement and torque retention.

Features:

  • The Copper core is a better conductor than Iridium or Platinum plugs
  • Copper dissipates heat much better than other materials
  • "C" - Cut Design un-shrouds the spark kernel for a better burn
  • Unlike Iridium or Platinum plugs, the ACCEL HP plugs are gapable
  • Machine rolled threads for precise thread engagement
  • One step colder than stock
  • Whether using on the street or on the strip, ACCEL HP Copper Core spark plugs deliver!
Brand Accel
Emission Code2
Product TypeSpark Plugs
WarrantyManufacturer's Limited 90 Day
UPC090127745762
Manufacturer Part Number578C1-6
Part Number578C1-6
2

This part is legal for sale and use on Emissions Controlled Vehicles when used in accordance with the manufacturers application guide because it is a direct or consolidated replacement part.

The following vehicles are considered Emissions Controlled Vehicles:

  • 1966 and newer U.S. manufactured California Certified vehicles
  • 1968 and newer U.S. manufactured Federally Certified vehicles
  • 1968 and newer Foreign manufactured vehicle
Manufacturer's Limited 90 Day: See Details
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    Some parts are not legal for use in California or other states with similar regulations.