Champion Iridium Plug Number RES9WYPB4 Spark Plug - 9901 Part #: 9901 Line: CHP Champion Iridium Plug Number RES9WYPB4 Spark Plug 2 Year LIMITED WARRANTY Seat: Tapered Thread Size: M14 Heat Range: 10 Hex Size (in): 5/8 Inch Preset Gap (in): 0.047 Inch Preset Gap (mm): 1.2mm Center Electrode Tip Material: Iridium Ground Electrode Tip Material: Platinum Service Number: RES9WYPB4 Metallurgy: Iridium/Platinum Show More Show Less