NGK Iridium Plug Number LTR6IX Spark Plug - 94374 Part #: 94374 Line: NGK NGK Iridium Plug Number LTR6IX Spark Plug 1 Year Limited Warranty Seat: Tapered Thread Size: M14-1.25 Heat Range: 6 Hex Size (mm): 16mm Hex Size (in): 5/8 Inch Preset Gap (in): 0.032 Inch Preset Gap (mm): 0.8mm Thread Reach (in): 0.984 Inch Center Electrode Core Material: Copper Center Electrode Tip Material: Iridium Approximate Resistor Value (Ohm): 5000 Ohm Insulator Height (mm): 52.5mm Insulator Height (in): 2.070 Inch Thread Reach (mm): 25mm Service Number: LTR6IX Metallurgy: Iridium Show More Show Less