Cometic BB 4.630in Bore .080 inch Chevy Mark IV Big Block (396 / 402 / 427) MLS Head Gasket

If you're working on a Chevrolet Mark IV Big Block engine, like the 396, 402, or 427, this Multi-Layer Steel (MLS) head gasket from Cometic is a solid option. It's specifically made with a 4.630-inch bore and a compressed thickness of 0.080 inches, designed to seal those big displacement V8s effectively. This gasket fits a wide range of classic Chevy vehicles, including models like the 1965-1975 Chevrolet Bel Air, 1967-1972 Chevrolet Camaro, and 1965-1974 Chevrolet Corvette.

Cometic builds these MLS gaskets with multiple layers of stainless steel, which gives them strength and helps them resist corrosion. The outer layers are coated with Viton, a heat-resistant rubber material that can handle tough sealing conditions and different surface finishes, whether you're mating aluminum heads to an aluminum block or to cast iron. This construction means you don't need to use any extra sealants, and the gasket can handle the stresses that come from different metals working together.