Cometic C5401-051 MLS Cylinder Head Gasket Bore Chevy SBC - 4.135 051

The Cometic C5401-051 is a multi-layer steel (MLS) cylinder head gasket engineered specifically for Chevrolet Gen-1 Small Block V8 engines. Featuring a 4.135-inch bore diameter and .051-inch compressed thickness, this gasket is designed for performance applications using aftermarket cylinder heads.

Key Features:

• Multi-layer steel construction provides superior sealing and durability under high combustion pressures
• 4.135-inch bore diameter accommodates standard and slightly overbored small block Chevy engines
• .051-inch compressed thickness allows for precise compression ratio tuning
• Undersized water ports designed for customization to match specific aftermarket head configurations
• MLS design adapts to engine movement and thermal expansion better than traditional composite gaskets
• Ideal for performance builds, forced induction, and high-compression applications

Cometic's MLS gaskets feature multiple layers of stainless steel with elastomeric coatings that provide excellent recovery and sealing characteristics. The undersized water ports give engine builders the flexibility to drill and match-port the gasket to their specific aftermarket heads, ensuring optimal coolant flow and preventing gasket overhang into the combustion chamber.