4.540 MLS Head Gasket .089 - BBC

The Cometic Gaskets 4.540 MLS Head Gasket .089 for BBC is designed for serious big-block Chevrolet builders who require reliability under extreme combustion pressures. This multi-layer steel (MLS) head gasket serves as a critical component in high-performance BBC engine assemblies, whether for street cruisers, bracket racers, or high-horsepower street machines.

With a bore diameter of 4.540 inches and a compressed thickness of .089 inches, this MLS gasket utilizes Cometic's proven multi-layer steel construction to ensure consistent sealing surfaces across repeated heat cycles and high-boost or carbureted compression loads. The .089-inch thickness is precisely engineered to work with standard big-block Chevy head decks and cylinder block surfaces, requiring proper preparation for optimal gasket crush and sealing force.

Engine builders working with 454, 502, or other big-block displacements that require a 4.540-bore application will find this gasket essential. Its MLS technology eliminates the need for sealers on fire rings and passages, simplifying assembly while enhancing reliability. The gasket's spring-back characteristics maintain clamp load even as fasteners relax during break-in, making it a vital investment for any BBC platform upgrade or rebuild.