Cometic Pontiac 400/428/455 V8 .036in MLS Cylinder 4.160in Bore

When you're rebuilding the top end of your Pontiac 400, 428, or 455 V8, getting the right seal between your block and heads is critical. This Multi-Layer Steel (MLS) head gasket from Cometic is built to handle the demands of these classic engines. It features a 4.160-inch bore and a compressed thickness of .036 inches, designed to provide a solid seal for a range of Pontiac applications.

Cometic constructs these gaskets with multiple layers of stainless steel for strength and corrosion resistance. The outer layers are coated with Viton, a heat-resistant rubber material that can handle tough sealing environments and various surface finishes, meaning you don't need additional sealants. The center layer is also stainless steel, providing a strong foundation. This construction helps them manage the forces created when mating different block and head materials, like aluminum heads to cast iron blocks.

This gasket fits a wide variety of Pontiac models from the late 60s through the late 70s, including popular choices like the Firebird, Grand Prix, and LeMans. Ensure you consult your vehicle's service manual for the correct installation procedures.