Cometic Chevrolet Mark-IV - GM Gen-V/VI Big Block V8 .140in MLS Cylinder Head Gasket - 4.570in Bore

When you're rebuilding a high-output Mark-IV, GM Gen-V/VI Big Block V8, you need a head gasket that can handle the pressure. This Cometic Multi-Layer Steel (MLS) head gasket is built for that job. It features multiple layers of stainless steel for strength and rebound resistance, with the outer layers coated in Viton rubber. This coating is heat-resistant up to 482°F and handles tough sealing environments, making it suitable for both aluminum and cast iron blocks.

The compressed operating thickness of this gasket is .036 inches, and it has a 4.570-inch bore. It's designed for aftermarket heads and includes undersized water ports, giving you flexibility for custom porting. Because it's an MLS gasket, it seals effectively without needing additional sealants, and it's built to withstand the forces created when mating different block and head materials, like aluminum to cast iron.

This gasket fits a wide range of classic Chevrolet vehicles, including models like the 1965-1975 Chevrolet Bel Air, 1965-1972 Chevrolet Impala, and 1967-1972 Chevrolet Camaro. It's a solid option for serious engine builds where reliable sealing is critical.