Compare Maximum number of 4 items selected ACDelco Rapidfire Platinum Spark Plug - 4 Part #: 4 Line: ACD ACDelco Rapidfire Platinum Spark Plug 3 Year Limited Warranty Seat: Gasket Thread Size: M14 Heat Range: 8 Hex Size (mm): 21mm Hex Size (in): 13/16 Inch Preset Gap (in): 0.043 Inch Preset Gap (mm): 1.1mm Thread Reach (in): 0.750 Inch Resistor Plug: Yes Center Electrode Core Material: Copper Center Electrode Tip Material: Platinum Approximate Resistor Value (Ohm): 6000 To 15000 Ohm Insulator Height (mm): 58.5mm Insulator Height (in): 2.303 Inch Ground Electrode Tip Material: Nickel Thread Reach (mm): 19.1mm Metallurgy: Platinum Show More Show Less