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ACCEL

ACCEL HP Copper Spark Plug

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

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

ACCEL HP Copper Spark Plug

Estimated Ship Date: 06/30/2026
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2

Emissions

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.

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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!

About ACCEL

Shop the official site of ACCEL's spark plug wires, ignition coils, and more. Discover innovative products for power, speed, & performance at Holley.com!

ApplicationFord EcoBoost
Brand ACCEL
CategorySpark Plugs
Emission Code2
GAP.030 IN
Heat Range1 Step Colder
Hex Size5/8 IN
LengthStandard
Part TypeSpark Plug
Product TypeSpark Plug
Projected TipYes
Qty6
Reach1 IN
ResistorYes
Seat TypeTapered
StyleCopper Core
Sub CategorySecondary Ignition
Thread Pitch1.25 MM
Thread Size14 MM
Torque Specification7.2-14.5 lb.ft.
UPC090127745762
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
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    Some parts are not legal for use in California or other states with similar regulations.