Champion Racing Spark Plug - 676 Part #: 676 Line: CHP Champion Racing Spark Plug Manufacturer's Defect Warranty Seat: Flat Thread Size: M14 Heat Range: 53 Hex Size (mm): 21mm Preset Gap (in): 0.025 Inch Preset Gap (mm): 0.60mm Thread Reach (in): 0.500 Inch Resistor Plug: Yes Center Electrode Tip Material: Nickel-Copper Alloy Ground Electrode Tip Material: Nickel Show More Show Less