NGK R5673-8 Spark PlugNGK Racing plugs bring ultra-high performance in variety of heat ranges. The center electrode of the NGK Racing spark plugs has special configurations and designs to ensure durability and ignitability. NGK Racing spark plugs are designed with extreme use in mind and meant to withstand the most grueling racing conditions. Part Number: R5673-8; Stock Number: 3249; Resistance (Ohm): 1; Ground configuration: Standard; Ground electrode core material: Nickel; Center electrode core material: Copper; Center electrode tip material: Nickel; Fits: I/O-1993-1975 FLAGSHIPCheck your engine and maintenance manual for the correct spark plug and only use as recommended by your engine's original equipment manufacturer. Using the wrong plug can reducing optimum performance, reduce fuel economy or cause damage to your engine.