Fits Harley-Davidson 1948-1974 Big Twins

Autolite^® Copper spark plugs are engineered to deliver quick starts and the power your vehicle or applications needs to meet performance expectations.

• The copper core center electrode aids in thermal control and improves resistance to fouling.
• Its specially engineered high nickel alloy center and ground electrode provides extended life.
• The high alumina multi-rib ceramic insulator provides thermal conductivity and superior insulation for increased strength.
• Designed with a nickel-plated shell that is corrosion resistant to provide increased durability for extended periods.