Compare Maximum number of 4 items selected NGK Plug Number R7438-8 Spark Plug - 4905 Part #: 4905 Line: NGK NGK Plug Number R7438-8 Spark Plug 1 Year Limited Warranty Seat: Flat Thread Size: M14-1.25 Heat Range: 8 Hex Size (in): 5/8 Inch Preset Gap (in): 0.028 Inch Preset Gap (mm): 0.7mm Center Electrode Core Material: Copper Center Electrode Tip Material: Iridium Approximate Resistor Value (Ohm): 5000 Ohm Insulator Height (mm): 50mm Insulator Height (in): 1.990 Inch Ground Electrode Tip Material: Platinum Thread Reach (mm): 26.5mm Service Number: R7438-8 Metallurgy: Iridium/Platinum Show More Show Less
Compare Maximum number of 4 items selected NGK Plug Number R2556G-8 Spark Plug - 91975 Part #: 91975 Line: NGK NGK Plug Number R2556G-8 Spark Plug 1 Year Limited Warranty Seat: Flat Thread Size: M12-1.25 Hex Size (in): 5/8 Inch Preset Gap (in): 0.028 Inch Preset Gap (mm): 0.7mm Center Electrode Core Material: Copper Center Electrode Tip Material: Iridium Approximate Resistor Value (Ohm): 5000 Ohm Insulator Height (mm): 51mm Insulator Height (in): 2.010 Inch Ground Electrode Tip Material: Platinum Service Number: R2556G-8 Metallurgy: Iridium/Platinum Show More Show Less