Cometic C5403-056 MLS Cylinder Head Gasket Chevy Small Block Bore - V8 4.200

The Cometic C5403-056 is a high-performance Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for Chevrolet Generation 1 Small Block V8 engines. This precision gasket features a 4.200-inch bore diameter and a .056-inch compressed thickness, making it ideal for performance builds and engine rebuilds.

Key Features:

• Multi-Layer Steel (MLS) construction provides superior sealing and durability under extreme conditions
• 4.200-inch bore diameter accommodates standard and slightly overbored small block Chevy applications
• .056-inch compressed thickness allows for precise compression ratio tuning
• Undersized water ports enable custom machining and porting to match aftermarket cylinder heads
• Designed for use with aftermarket performance heads
• Embossed stainless steel layers with FKM (Viton) rubber coating for exceptional sealing

Cometic's MLS gaskets are constructed from multiple layers of stainless steel, providing the ability to withstand extreme cylinder pressures while maintaining superior sealing properties. The undersized water port design gives engine builders the flexibility to customize coolant flow paths when using aftermarket heads with varying port configurations. This gasket is compatible with Gen-1 Small Block Chevrolet engines including 265, 283, 302, 327, 350, and 400 cubic inch variants when equipped with aftermarket cylinder heads.