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Racing Plug, 14mm Thread Size, 12.7mm (1/2") Reach, 13/16" (20.6mm) Hex Size, Gasket Seat, Non-Resistor, Copper Core, Solid Terminal, .020" (0.508mm) Gap, Heat Range 86 Regular gap racing plug positions the spark approximately 1/16" into the combustion chamber. Colder heat ranges have a shortened ground electrode. This aids in exposing the spark to the air fuel mixture and helps avoid pre-ignition from an overheated ground electrode. Constructed with a nickel shell for faster heat dissipation and copper core or double copper (when noted) for further heat removal, all racing plugs are non resistor (unless specially noted).