NGK 4554 - R5671A-8 Racing Spark Plug

Sold as singles. Thread Size 14mm Thread Pitch 1.25mm Seat Type Gasket Reach 19mm (3/4") Gap .031" (0.8mm) Heat Range 8 Center Electrode Material Nickel Center Electrode Projection Non-Projected Ground Electrode Material Nickel NGK Racing Series plugs are engineered to withstand the harshest engine conditions. - Special insulator nose configurations improve throttle response - Corrugated ribs prevent flashover - Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer - Copper core aids in heat removal - Triple seals prevent leakage