Spark Plugs - '75-'99 Big Twin

• Plugs have a unique look with a black ceramic body and bold red logo/script
• Insulator is made of 95% pure alumina, features strong resistance to heat shock and superior insulation
• Multi-rib design of the insulator eliminates flashover
• Nickel-plated housing prevents oxidation and corrosion
• Multi-layer gaskets and heat crimping process ensure a leak-free, gas-tight seal
• Copper core electrode prevents oxidation and corrosion, has good electrical and heat conductivity and creates long spark plug service life

Manufacturer Part Number: E18-6663SDS