Cometic Pontiac 400/428/455 V8 .036in MLS Cylinder Head Gasket - 4.200in Bore

If you're rebuilding the top end of your Pontiac 400, 428, or 455 V8 engine, a solid set of head gaskets is crucial for sealing the combustion chamber and coolant passages. This Cometic Multi-Layer Steel (MLS) gasket is built to handle the demands of these classic V8s, offering a compressed thickness of .036 inches and a bore size of 4.200 inches, which is a common size for these engines.

Cometic's MLS design uses 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 ensures a tight seal against aluminum or cast iron heads and blocks, even under high output conditions. Because they're MLS, these gaskets don't require any additional sealants, making installation more straightforward. The center shim layer can be varied to achieve different thickness requirements, and this particular gasket is set at .036 inches compressed thickness.

This gasket fits a wide range of Pontiac models from the late 60s through the late 70s, including popular choices like the Firebird, GTO, and Grand Prix, as well as other GM vehicles from the era such as the Buick LeSabre and Oldsmobile 88. Ensure you have the correct bore size and thickness for your specific build.