Cometic C10339 MLS Head Gasket 3.625" Bore .040" S&S Knucklehead 1936-1947

The Cometic C10339 is a premium Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for S&S Knucklehead engines with a 3 5/8" (3.625") bore size used in 1936-1947 Harley-Davidson applications. This high-performance gasket features a .040" compressed thickness and a 3.715" inner diameter, providing optimal sealing for both vintage restorations and modern performance builds.

Key Features:

• Multi-Layer Steel (MLS) construction with three layers for superior sealing performance
• Stainless steel center layer sandwiched between two viton-coated spring steel embossed outer layers
• Non-intrusive rivets hold the layers together for maximum durability
• .040" compressed thickness (standard compression height)
• 3.715" inner diameter bore opening for precise fitment
• Designed to withstand extreme shearing forces in the head gasket environment
• Proprietary high-temperature coating provides micro-sealing against fluids
• Reduced clamping load requirements minimize bore distortion

This gasket is specifically designed for S&S Cycle Knucklehead engines and performance builds utilizing 3.625" bore cylinders. The MLS design offers superior sealing performance compared to traditional fiber gaskets, making it ideal for high-compression and high-performance applications while maintaining reliability in vintage-style engines.