Cometic Pontiac 400/428/455 V8 .089in MLS Cylinder Head Gasket - 4.200in Bore

This is a Cometic Multi-Layer Steel (MLS) head gasket, designed for Pontiac 400, 428, and 455 cubic inch V8 engines. It features a bore size of 4.200 inches and a compressed thickness of .089 inches, making it a solid option for rebuilding or upgrading the top end of these classic V8s. MLS gaskets are known for their ability to handle the demands of higher output engines and are suitable for applications using aluminum heads with either aluminum or cast iron blocks.

Cometic constructs these gaskets 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 degrees Fahrenheit. This coating ensures a reliable seal without the need for additional sealants, even under challenging sealing conditions and on various surface finishes. The center layer is uncoated stainless steel, allowing for precise thickness control.

This gasket fits a range of vehicles from the late 1960s through the late 1970s, including popular models like the Pontiac Firebird, Grand Prix, and LeMans. It's a well-built component that helps ensure proper cylinder sealing for optimal engine performance.