What’s firing your engine? NGK racing spark plugs are built to withstand the severe mechanical and thermal shock associated with high-revving, high-compression engines. NGK racing plugs feature special electrode materials—precious metals like platinum, iridium, and ruthenium—for greater durability and low voltage requirements. Fine-wire center and ground electrodes provide better sparking and enhanced ignitability. And, the unique arrangement of insulator noses improves throttle response! Whether you’re a weekend warrior or an expert racer, rocket your way to victory with racing spark plugs from NGK—the people who spark winners! Spark Plug Thread Size: 14mm Spark Plug Reach (in.): 1.043 in. Spark Plug Reach (mm): 26.50mm Manufacturer Heat Range: 8 Shorty Spark Plug: No Resistor: Yes Electrode Tip Material: Nickel alloy Electrode Core Material: Copper Spark Plug Seat Style: Gasket Wrench Diameter: 5/8 in. Ground Strap Quantity: One Quantity: Sold individually. Notes: Low angle ground electrode.