Compare Maximum number of 4 items selected Champion Racing Spark Plug - 673 Part #: 673 Line: CHP Champion Racing Spark Plug 1 Year Limited Warranty Seat: Gasket Thread Size: M14 Heat Range: 59 Hex Size (mm): 21mm Hex Size (in): 13/16 Inch Preset Gap (in): 0.025 Inch Preset Gap (mm): 0.65mm Thread Reach (in): 0.750 Inch Center Electrode Tip Material: Nickel Ground Electrode Tip Material: Nickel Metallurgy: Copper Show More Show Less