Cometic C5399-045 MLS Cylinder Head Gasket Bore Chevy Small Block - 4.030 045

The Cometic C5399-045 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 4.030-inch bore diameter and .045-inch compressed thickness, making it ideal for performance and racing applications requiring superior sealing capabilities.

Key Features:

• Multi-Layer Steel (MLS) construction provides exceptional sealing under high-cylinder pressure and temperature conditions
• 4.030-inch bore diameter accommodates standard and slightly over-bored small block Chevy engines
• .045-inch compressed thickness allows for precise compression ratio tuning
• Undersized water ports designed for aftermarket cylinder heads, allowing custom port matching and coolant flow optimization
• Compatible with Chevrolet Gen-1 Small Block V8 engines (262-400 cubic inches)
• Superior torque retention and reusability compared to composite gaskets

Cometic's MLS gaskets feature multiple layers of stainless steel with proprietary coatings that provide micro-sealing at the combustion seal while maintaining flexibility to absorb minor deck surface imperfections. The undersized water ports give engine builders the flexibility to custom-match coolant passages to aftermarket heads for optimal flow and sealing. Ideal for street performance, racing, and forced induction applications where reliable head sealing is critical.