Representative Image Champion Iridium Spark Plug - 9803S Part #: 9803S Line: CHP Champion Iridium Spark Plug 2 Year LIMITED WARRANTY Seat: Flat Thread Size: M14 Heat Range: 8 Hex Size (in): 5/8 Inch Preset Gap (in): 0.041 Inch Preset Gap (mm): 1.05mm Thread Reach (in): 0.750 Inch Resistor Plug: Yes Center Electrode Tip Material: Iridium Insulator Height (in): 0.125 Inch Ground Electrode Tip Material: Platinum Show More Show Less