NGK G-Power Platinum Spark Plug UR4GP (8 Pack) for GMC C15 1978-1978 6.6L/400

These G-Power Platinum spark plugs deliver the power and quality that you expect from NGK. The fine pure-platinum electrode tip remains virtually unchanged and reaches self-cleaning temperatures to deliver longer durability and optimum performance. Compared to conventional plugs, G-Power plugs deliver better starts, superior acceleration, and greater fuel economy. Trivalent metal plating provides superior anti-corrosion and anti-seizing properties. Corrugated ribs prevent flashover. Trapezoid cut ground electrode reduces quenching. Shorty Spark Plug: No. Resistor: Yes. Manufacturer Heat Range: 4. Electrode Tip Material: Platinum. Electrode Core Material: Copper. Insulator Type: Projected. Spark Plug Thread Size: 14mm. Spark Plug Reach: 0.460 in. Spark Plug Seat Style: Tapered. Wrench Diameter: 5/8 in. Ground Strap Quantity: One. Copper core aids in heat removal. Triple seals prevent leakage. Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer. Fine wire platinum tipped center electrode reduces required voltage for better starts, superior acceleration and increased fuel economy.