ACCEL U-Groove performance spark plugs have a patented U-shaped ground electrode that produces a double wide, hotter spark to ignite standard or even the highest compression engines. The sintered alumina heavy-duty five rib insulator eliminates flashover and overheating that occurs with high performance and long range applications. ACCEL U-Groove spark plugs use the purest copper/nickel alloy electrode to produce a broad heat range that is highly foul resistant and dissipates heat better than any other material. Years of racing and street performance research has proven that ACCEL U-Groove spark plugs deliver the hottest spark and the highest performance of any spark plug available.
  • 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
  • One Step Colder Than Stock
  • Whether Using On Street/Strip The HP Copper Core Plugs Deliver!

Application Summary:

Year Make/Model
2012-2017 Ford Edge
2013-2017 Ford Escape
2015-2017 Ford Expedition
2012-2017 Ford Explorer
2011-2017 Ford F-150
2014-2017 Ford Fiesta
2010-2017 Ford Flex
2013-2017 Ford Focus
2013-2017 Ford Fusion
2017 Ford GT
2015-2017 Ford Mustang
2013-2017 Ford Police Interceptor Sedan
2014-2017 Ford Police Interceptor Utility
2014-2017 Ford Special Service Police Sedan
2010-2017 Ford Taurus
2014-2016 Ford Transit Connect
2015-2017 Ford Transit-150
2015-2017 Ford Transit-250
2015-2017 Ford Transit-350
2015-2017 Ford Transit-350 HD
2015-2017 Land Rover Discovery Sport
2013-2015 Land Rover LR2
2012-2017 Land Rover Range Rover Evoque
2015-2017 Lincoln MKC
2010-2016 Lincoln MKS
2010-2017 Lincoln MKT
2013-2017 Lincoln MKZ
2015-2016 Lincoln Navigator
Application Ford EcoBoost
Assembly Method Tapered
California Proposition 65 No
Country of Origin (Primary) CZ
Emission Code Legal US
GAP .030"
GTIN 00090127745755
Gap Size 0.030 in.
Harmonized Tariff Code (Schedule B) 8409915085
Hazardous Material Code N
Heat Range 1 Step Colder
Hex Size 0.625 in.
Length Standard
Life Cycle Status Code Available to Order
NAFTA Preference Criterion Code D
Package Quantity 4
Product Type Spark Plug
Projected Tip Yes
Prop 65 Yes/No No
Qty 4
Reach 1.000 in.
Resistor Yes
SDR Required Flag N
Seat Type Tapered
Style Copper Core
Thread Pitch 1.25mm
Thread Size 14mm
Torque Capacity 7.2 ft/lbs. - 14.5 ft/lbs.
Torque Capacity (ft/lbs.) 7.2 ft/lbs. - 14.5 ft/lbs.
Torque Specification 7.2-14.5 lb.ft.
WARNING CA Proposition 65 No

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ACCEL 578C1-4 HP Copper Spark Plug

Vehicle Fitment

Fitment: Year Required

Product Information

  • Brand: ACCEL
  • Product Number: 578C1-4
  • $18.04