Cometic GM LS1 SB 3.910 inch Bore .120 inch MLS Head Gasket

This is a Cometic Multi-Layer Steel (MLS) head gasket designed for GM LS Gen-3 and Gen-4 small block V8 engines. It features a 3.910-inch bore and a compressed thickness of 0.120 inches, making it suitable for a wide range of GM vehicles like the Chevrolet Corvette, Silverado, and GMC Sierra. These gaskets are built to handle the demands of high-output engines without needing additional sealants.

Cometic constructs these MLS gaskets from 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. This construction is ideal for mating aluminum heads to either aluminum or cast iron blocks, as it can manage the shearing forces that can occur between different metals. The center layer is stainless steel and can be varied to achieve different thicknesses, like the 0.120-inch compressed thickness found in this gasket.

Because these are multi-layer steel gaskets, they offer improved sealing performance and durability compared to traditional composite gaskets. They are a solid option when rebuilding or modifying your LS engine, especially if you're looking for a reliable seal that can withstand higher operating pressures and temperatures.