E3.66 is a 14mm, 1.000 Inch reach plug with a taper seat. It fits a wide variety of late model applications, especially Hemi applications. E3.66 is widely stocked in automotive retail stores. E3 automotive plugs have three legs securing the DiamondFIRE electrode to the shell. This allows for excellent heat transfer, and helps to create more turbulence in the cylinder. The patented DiamondFIRE side wire is proven to increase power, reduce fuel consumption, and improve hydrocarbon emissions in long-term use. The unique ground electrode and full-size center electrode also provides optimal performance for a guaranteed five years or 100,000 miles.

Patented DiamondFIRE Ground Electrode

Edge-To-Edge Ground Electrode Out Performs Other Plug Designs

E3 Equipped Engines Can Minimize Venting Of Unburned Fuel

Burn Fuel More Efficiently By Burning Fuel More Completely

Provide A Like-New Performance For The Life Of The Plug

The Most Environmentally-Friendly Plug Available

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