Cometic Pontiac 400/428/455 V8 .051in MLS Cylinder 4.160in Bore

If you're rebuilding the top end of your Pontiac 400, 428, or 455 V8 engine, a solid head gasket is crucial for sealing combustion pressure. This Multi-Layer Steel (MLS) gasket from Cometic is built to handle the demands of higher output engines, ensuring a reliable seal between your cylinder head and block.

This gasket is constructed with 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 temperatures up to 482°F (250°C) and works well with both aluminum and cast iron components. The center shim layer can be varied to achieve different compressed thicknesses, and in this case, it results in a 0.051-inch gasket with a 4.160-inch bore, designed to fit a range of Pontiac V8s from the late 60s through the late 70s, including popular models like the Firebird, Grand Prix, and LeMans.

Because these are MLS gaskets, they don't require any additional sealants, making installation more straightforward. They are designed to withstand the forces created when mating different metals, like aluminum heads to cast iron blocks, and offer a robust sealing solution for your rebuild.