Cometic C9730 HD Big Bore Base Gasket 3-5/8" & 3-3/4" for 1340 EVO .020" Thickness

The Cometic C9730 is a high-performance base gasket designed specifically for Harley-Davidson 1340 Evolution engines with big bore cylinder configurations. This precision-engineered gasket accommodates both 3-5/8" and 3-3/4" big bore cylinder sizes, making it an ideal solution for performance engine builds and rebuilds.

Key Features:

• Manufactured from .020" thick RCM (Rubber Coated Metal) material for superior sealing and durability
• Compatible with 3-5/8" (3.625") and 3-3/4" (3.750") big bore cylinders on 1340cc Evolution engines
• Heavy-duty construction designed to withstand extreme heat and compression cycles
• RCM construction combines a steel core with rubber coating for optimal conformability to sealing surfaces
• Prevents oil and combustion gas leakage between cylinder and crankcase
• Precision-cut to OEM specifications with enhanced material properties

Cometic gaskets are engineered using advanced materials and manufacturing processes to deliver reliable performance in demanding applications. The RCM Special designation indicates this gasket features Cometic's premium rubber-coated metal composite construction, providing exceptional resistance to blowout while maintaining flexibility for proper surface conformity. This gasket is essential for maintaining proper compression and preventing costly oil leaks in big bore Evolution engine builds.