Compare Maximum number of 4 items selected ACDelco Professional Platinum Spark Plug - 41-812 Part #: 41-812 Line: ACD ACDelco Professional Platinum Spark Plug 100,000 Mile Limited Warranty Seat: Tapered Thread Size: M14 Heat Range: 9 Hex Size (mm): 16mm Hex Size (in): 5/8 Inch Preset Gap (in): 0.041 Inch Preset Gap (mm): 1.05mm Thread Reach (in): 0.680 Inch Resistor Plug: Yes Center Electrode Core Material: Copper Center Electrode Tip Material: Platinum Approximate Resistor Value (Ohm): 3000 To 10000 Ohm Insulator Height (mm): 53mm Insulator Height (in): 2.087 Inch Ground Electrode Tip Material: Platinum Thread Reach (mm): 17.5mm Metallurgy: Double Platinum Show More Show Less