Cometic C5403-027 MLS Cylinder Head Gasket Chevy Small Block Bore - for V8 4.200

The Cometic C5403-027 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 .027-inch compressed thickness, making it ideal for performance and racing applications.

Key Features:

• Multi-Layer Steel (MLS) construction provides superior sealing and durability under extreme cylinder pressures
• 4.200-inch bore diameter accommodates performance builds and oversized pistons
• .027-inch compressed thickness allows for precise compression ratio tuning
• Undersized water ports designed for aftermarket cylinder heads, allowing customization to match specific head castings
• Engineered for Chevrolet Gen-1 Small Block V8 engines (262-400 cubic inch platforms)
• Exceeds OEM specifications for high-performance and racing applications

Cometic's MLS gasket technology uses multiple layers of stainless steel with advanced coating systems to provide maximum sealing capability while accommodating engine movement and thermal expansion. The undersized water ports give engine builders the flexibility to machine custom water jacket openings that perfectly match aftermarket cylinder heads, optimizing coolant flow and eliminating potential leak paths.