Cometic Pontiac 400/428/455 V8 .080in MLS Cylinder Head Gasket - 4.200in Bore

This is a Cometic Multi-Layer Steel (MLS) head gasket designed for Pontiac 400, 428, and 455 V8 engines. It features a compressed thickness of 0.080 inches and a bore size of 4.200 inches, fitting a range of classic Pontiac, Buick, and Oldsmobile vehicles from the late 60s through the late 70s, such as the Pontiac Firebird, Grand Prix, and Buick LeSabre. MLS gaskets are built for high-output engines and provide a strong seal without needing additional sealants.

Cometic constructs these gaskets using multiple layers of stainless steel for increased strength and resistance to corrosion. The outer layers are coated with Viton, a heat-resistant rubber material that can handle demanding sealing environments and various surface finishes. This construction is ideal for sealing between aluminum heads and either aluminum or cast iron blocks, effectively managing the shearing forces that can occur between different metals. The center layer is stainless steel, and its thickness can be varied to meet different sealing requirements.