Cometic Pontiac 428 / 455 V8 4.380in Bore .060in MLS-5 Head Gasket

This is a Cometic Multi-Layer Steel (MLS) head gasket designed for Pontiac 428 and 455 V8 engines. It features a 4.380-inch bore and a compressed thickness of 0.060 inches, making it suitable for a range of classic GM vehicles like the Pontiac Firebird, Bonneville, and Catalina, as well as some Buick and Oldsmobile models from the late 60s and 70s.

MLS head gaskets are built 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 tough sealing environments and various surface finishes, ensuring a reliable seal without the need for additional sealants. This construction is ideal for engines using aluminum heads with either aluminum or cast iron blocks, as it can manage the shearing forces between different metals.