Autolite Copper Resistor Spark Plug: Up to 30k Mile Life Expectancy Fits select: 1975-1987 BUICK REGAL, 1975-1985 PONTIAC FIREBIRD

Autolite has over 100 years of engineering experience and has sold over 11 billion plugs. To deliver quick starts, good fuel economy and smooth acceleration, Autolite Copper Core spark plugs are designed to meet or exceed OES design requirements. Consider upgrading to Autolite Platinum, Double Platinum or Iridium XP plugs for improved engine performance. Copper core plugs are the industry standard.

Copper-glass seal bonds insulator, terminal post center electrode together, assures full required voltage at spark gap, gas-tight seal (100% leak proof) Multi-rib insulator reduces danger of "flash-over" One-piece terminal post adds strength Resistor reduces radio frequency interference (RFI) and electrode erosion Electrode Tip Material: Resistor Reach: .460 In Resistor: Suppressor Seat Type: Tapered Thread Diameter: 14 mm Tip Configuration: Power Wrench Diameter: 5/8 In