Cometic C5400-066 MLS Cylinder Head Gasket Small Block Chevy Bore - 4.125 066

The Cometic C5400-066 is a high-performance Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for Chevrolet Gen-1 Small Block V8 engines. This precision gasket features a 4.125-inch bore diameter and .066-inch compressed thickness, making it ideal for performance builds requiring reliable sealing under extreme conditions.

Key Features:

• Multi-Layer Steel construction provides superior sealing and durability
• 4.125-inch bore diameter accommodates standard and slightly overbored small block Chevy applications
• .066-inch compressed thickness allows for precise compression ratio tuning
• Undersized water ports designed for aftermarket cylinder heads, allowing custom port matching and optimization
• Embossed stainless steel construction resists corrosion and maintains seal integrity
• Compatible with Gen-1 Chevy Small Block V8 engines (262ci-400ci)

Cometic's MLS gaskets feature multiple layers of stainless steel with a Viton rubber coating, providing exceptional resistance to blowout and improved recovery characteristics compared to traditional composite gaskets. The undersized water port design gives engine builders the flexibility to custom-match coolant passages to their specific cylinder head configuration, ensuring optimal flow and eliminating potential leak paths.