Cometic Pontiac 400/428/455 V8 .086in MLS Cylinder Head Gasket - 4.380in Bore

What you get here is a Cometic Multi-Layer Steel (MLS) head gasket designed specifically for Pontiac 400, 428, and 455 cubic inch V8 engines. This gasket has a bore size of 4.380 inches and a compressed thickness of .086 inches, making it a solid choice for rebuilding or refreshing the top end of these classic V8s. It's built to handle the demands of higher output engines and is suitable for use with both aluminum and cast iron blocks.

This gasket is constructed from multiple layers of stainless steel, which gives it increased strength and the ability to rebound, helping it resist corrosion. The outer layers are coated on both sides with Viton, a heat-resistant rubber material that can handle temperatures up to 482 degrees Fahrenheit. This coating ensures a good seal even in harsh conditions and on various surface finishes, and the gasket doesn't require any additional sealants. The center layer is uncoated stainless steel, and its thickness can be varied to meet different requirements, which is how Cometic achieves the specific .086 inch compressed thickness in this part.

This gasket fits a wide range of classic GM vehicles from the late 60s through the late 70s, including models like the Pontiac Firebird, Grand Prix, and Catalina, as well as some Buick and Oldsmobile models from 1975. It's a well-built component for anyone working on these specific Pontiac V8 engines.