Cometic GM LS1 SB 4.000 inch Bore .036 inch MLS Head Gasket

This Cometic Multi-Layer Steel (MLS) head gasket is built with a compressed thickness of 0.036 inches and designed for a 4.000 inch bore, making it a solid choice for GM LS1 engines and many other GM LS Gen-3/4 small block V8 applications. MLS gaskets are known for their strength and ability to provide a reliable seal, even in high-output engines, without needing additional sealants. They are well-suited for combinations of aluminum heads with either aluminum or cast iron blocks, as they can handle the stresses that arise from dissimilar metals.

The construction features multiple layers of stainless steel for increased strength and resistance to corrosion, along with the ability to rebound. The outer layers are coated on both sides with Viton, a heat-resistant rubber material capable of withstanding temperatures up to 482 degrees Fahrenheit, ensuring it can handle demanding sealing environments and various surface finishes. The center layer is uncoated stainless steel, allowing for variations in thickness to meet specific requirements. This well-built gasket fits a wide range of GM vehicles, including models like the Chevrolet Corvette, Cadillac CTS, and Buick LaCrosse.