Marine Performance Spark Plugs

The Autolite copper core spark plugs feature a cold-formed steel shell with precision-rolled threads, a full copper core electrode to provide better performance, and a one-piece terminal post to add strength. Autolite copper core spark plugs use a copper-glass seal that bonds the insulator and terminal post center electrode together. This ensures full voltage at the spark gap and a 100 percent leakproof, gas-tight seal. Autolite features an extensive application guide to cover just about everything with an internal combustion engine.

For many years NGK Spark Plugs have been firing racing engines throughout the world. NGK Spark Plugs have become an icon in spark plug technology. As a result of our superior quality, you'll have confidence knowing you have the World Leader in spark plug technology firing your way to victory.

Economical performance and improved ignitability over standard NGK Spark Plugs original equipment manufacturer and racer approved.

• Lowers ignition system voltage requirements
• Greater ignitability and performance over conventional spark plugs
• Trivalent Metal Plating has superior anti-corrosion and anti-seizing properties
• Increased fuel economy and lower emissions
• Highly durable against electrical and chemical wear
• Good performance spark plug

ACDelco Spark Plugs are precisely engineered and manufactured to provide everyday reliability and efficient performance, helping your engine run cleaner and longer.
Available for most older vehicle makes and models, ACDelco Spark Plug design features:

• A copper-core center electrode that helps provide improved heat transfer to the tip, giving you the reliability you're looking for while improving its resistance to low-speed carbon fouling.
• Hot-tip insulator heats fast and fires hot to promote longer electrode life for miles of dependable performance.
• Nickel-chrome alloy sheathing on the ground and center electrodes that resists wear from spark erosion and the corrosive environment of the combustion chamber.