NGK Iridium IX Spark Plug Box of 4 (DCPR8EIX SOLID)

The NGK 97181 is an Iridium IX spark plug designed for performance enthusiasts. It features a fine wire center electrode for durability and a stable spark, with an iridium alloy that has a high melting point suitable for high-performance engines. This spark plug includes trivalent metal plating for anti-corrosion and anti-seizing properties, corrugated ribs to prevent flashover, and a pure alumina silicate ceramic insulator for strength and heat transfer.

The spark plug has a 12mm thread diameter with a 1.25mm pitch and a gasket seat type. It offers a 19mm (3/4") reach, a 5/8" (16mm) hex size, and a solid terminal type. The fine wire center electrode is 0.6mm with a projected type, while the ground electrode is standard with a nickel material and a taper cut shape. It also features a resistor with a value of 5k Ohm and a heat range of 8. The expected longevity is 50,000 miles. Torque specifications for cast iron are 10.8-18 lb. ft., and for aluminum, they are 10.8-14.5 lb. ft.