Cometic C9108 HD Copper Base Gasket 3-13/16" Bore .016" Thick for Harley 1340

The Cometic C9108 is a high-performance copper base gasket designed for Harley-Davidson 1340cc Big Twin engines. This gasket features a 3-13/16" (3.8125") bore diameter and a compressed thickness of .016", providing precise combustion sealing and exceptional heat transfer.

Key Features:

• Premium copper construction for superior thermal conductivity and durability
• 3-13/16" bore diameter optimized for 1340cc Evolution and Shovelhead engines
• .016" compressed thickness allows for precise compression ratio tuning
• Heavy-duty design for high-performance and racing applications
• No oil drain holes configuration
• Engineered to withstand extreme cylinder pressures and temperatures
• Provides consistent sealing even after multiple heat cycles

Cometic gaskets are manufactured using advanced materials and proprietary manufacturing processes to ensure reliable performance in demanding applications. This copper base gasket is ideal for custom builds, engine rebuilds, and performance upgrades where precise head-to-cylinder sealing is critical.