NGK TR6 V-Power Spark Plugs The exclusive 90 deg. designed nickel center electrode of the NGK V-Power spark plug produces the spark at the electrode’s edges. This hot, clean spark makes better contact with the air/fuel mixture resulting in combustion that is more complete & efficient. Specifications Center Electrode Core Material: Copper Core Center Electrode Tip Material: Nickel w/ V-groove Gap Size: 0.040 in Ground Configuration: Standard Ground Electrode Core Material: Nickel Core Ground Electrode Quantity: 1 Ground Electrode Tip Design: Standard Hex Size: 5/8″ Insulator Height: ISO Manufacturer Heat Range: 6 Reach: 17.5mm Resistance: 5K ohms Seat Type: Tapered Thread Diameter: 0.551 in Applications 1989 Pontiac Firebird 1989-1990 Pontiac Grand Prix What’s In The Box? (1)Spark Plug Warranty Manufacturer Standard Warranty