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ACCEL 578-4 HP Copper Spark Plug

6834850 - 578-4

Stock Heat Range - 0.030 in. Gap - 5/8 in. Hex Size - 1 in. Reach - Resistor - Tapered Seat Type - 1.25mm Thread Pitch - 14mm Thread Size - 4 Pack

578-4 HP Copper Spark Plug ACCEL

View the Full List of Automotive Applications »

Pricing: $18.41


ACCEL - HP Copper Spark Plug - Part#: 578-4 Features:

  • 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 Better Burn
  • Unlike Iridium Or Platinum Plugs - The HP Plugs Are Gapable
  • Machined Rolled Threads For Precise Thread Engagement
  • Stock Heat Range
  • Whether Using On Street/Strip The HP Copper Core Plugs Deliver!

View the Full List of Automotive Applications »

Below is an abbreviated list of applications for the HP Copper Spark Plug.
Discovery Sport, Edge, Escape, Explorer, Fiesta, Focus, Fusion, LR2, MKC, MKT, MKZ, Mustang, Range Rover Evoque, Special Service Police Sedan, Taurus, Transit Connect, Ford, Land Rover, Lincoln, 2017


For more than 40 years, ACCEL has been a leader in performance fuel and ignition systems, proving itself on the racetracks and drag strips of the world – and on the street. With an ever-expanding line of SuperCoils and all the spark plug wires, tune-up kits, and fuel injectors hot rodders have trusted and relied on for years, ACCEL is constantly developing innovative new products designed to push power, speed, and performance to match advancements in automotive technology. Now part of Holley Performance, ACCEL offers a comprehensive selection of performance products, including coils, digital fuel injection systems, fuel injectors, distributors, caps, rotors, ignition wires, spark plugs.


  • 6834850 - 578-4
  • 6834850
  • 578-4
  • 090127745724
  • New

Shipping Information

  • Item Requires Shipping
  • 0.3 lbs.
  • W1.0000” x H3.6000” x L4.9000”

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