Champion Racing Plug Number QC59C Spark Plug - 1008 Part #: 1008 Line: CHP Champion Racing Plug Number QC59C Spark Plug Manufacturer's Defect Warranty Seat: Gasket Thread Size: M14 Heat Range: 59 Hex Size (mm): 16mm Hex Size (in): 5/8 Inch Preset Gap (in): 0.025 Inch Preset Gap (mm): 0.64mm Thread Reach (in): 0.750 Inch Center Electrode Tip Material: Nickel Ground Electrode Tip Material: Nickel Service Number: QC59C Metallurgy: Copper Show More Show Less