Cometic GM LS1 SB 4.000 inch Bore .045 inch MLS Head Gasket

If you're rebuilding the top end of your GM LS-based engine, getting the right head gasket is crucial for a solid seal. This Multi-Layer Steel (MLS) head gasket from Cometic is built for the demands of high-output engines, offering a reliable seal between your cylinder head and block. It's designed to fit a wide range of GM LS Gen-3 and Gen-4 small block V8 engines, including popular models like the Chevrolet Corvette, Camaro, and Silverado trucks.

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 tough sealing environments and varying surface finishes, ensuring a tight seal without needing additional sealants. The compressed thickness is set at 0.045 inches, with a 4.000-inch bore diameter, making it suitable for many LS engine builds.

This MLS design is effective for sealing between aluminum heads and either aluminum or cast iron blocks, as it can manage the shearing forces that can occur between dissimilar metals. The layered stainless steel also provides rebound strength, helping to maintain seal integrity under pressure.