Cometic C5399-056 MLS Cylinder Head Gasket Chevy Small Block Bore Thick - 4.030 056

The Cometic C5399-056 is a Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for Chevrolet Gen-1 small block V8 engines. This precision-manufactured gasket features a 4.030-inch bore diameter and .056-inch compressed thickness, making it ideal for performance builds and engine rebuilds requiring reliable combustion sealing.

Key Features:

• Multi-Layer Steel (MLS) construction provides superior sealing and durability under high-temperature, high-pressure conditions
• 4.030-inch bore diameter accommodates standard and slightly overbored small block Chevy applications
• .056-inch compressed thickness allows for proper quench and compression ratio tuning
• Designed for aftermarket cylinder heads with undersized water ports for custom machining and fitment optimization
• Resists blown gaskets and coolant leaks better than conventional composite gaskets
• Suitable for performance street, racing, and forced induction applications

Cometic's MLS gaskets feature multiple layers of stainless steel with elastomeric coatings that conform to sealing surfaces while maintaining structural integrity. The undersized water ports on this gasket provide flexibility for engine builders to custom-match port sizes to their specific cylinder heads, ensuring proper coolant flow and eliminating potential leak paths.