Cometic GM / Mercury 8.1L 496ci 110.49mm .040 inch MLS RHS Head Gasket

Cometic Gasket is known for making well-built sealing solutions for performance and heavy-duty applications. This Multi-Layer Steel (MLS) head gasket is specifically designed for the GM 8.1L (496ci) Vortec L18 Gen-VII big block V8 engine, and it's the right-side gasket with a 4.350-inch bore. It's built with multiple layers of stainless steel for increased strength and corrosion resistance, and the outer layers are coated with Viton, a heat-resistant rubber material that can handle tough sealing environments up to 482°F (250°C). This gasket is designed to provide maximum sealing performance for high-output engines and doesn't require any additional sealants, making it suitable for both aluminum and cast iron block combinations.

The compressed operating thickness of this gasket is 0.040 inches, and the center shim layer is stainless steel, which can be varied to achieve different thicknesses. MLS gaskets are a solid option because they can handle the shearing forces that occur between different block and head materials, like aluminum heads on cast iron blocks. This particular gasket fits a range of heavy-duty trucks and SUVs, including models like the Chevrolet Suburban 2500, GMC Sierra 2500 HD, and Chevrolet Avalanche 2500, from the early 2000s through 2007.