Compare Maximum number of 4 items selected Champion Racing Spark Plug - 278 Part #: 278 Line: CHP Champion Racing Spark Plug Manufacturer's Defect Warranty Seat: Flat Thread Size: M14 Heat Range: 61 Hex Size (mm): 16mm Hex Size (in): 5/8 Inch Preset Gap (in): 0.030 Inch Preset Gap (mm): 0.78mm Thread Reach (in): 0.750 Inch Resistor Plug: No Center Electrode Tip Material: Nickel Ground Electrode Tip Material: Nickel Show More Show Less