Spark Plug Application Automotive Hex Size 9/16 in Thread Size 0.472 in Thread Reach 1.04 in Ground Electrode Quantity 1 Ground Electrode Tip Design Standard Gap Size 0.043 in Resistor Plug Yes Hex Size - Metric 14 mm Thread Reach - Metric 26.5 mm Insulator Material Ceramic Manufacturer Heat Range 6 Seat Type Tapered Center Electrode Diameter 0.039 in Ground Electrode Material Platinum Core Center Electrode Material Platinum Compatible Engine Type V8