Cometic GM L18 Vortec 8100 Gen-VII Big Block V8 .040in MLS Cylinder Head Gasket - 4.450in Bore - LHS

If you're rebuilding the top end of your GM L18 Vortec 8100 Gen-VII Big Block V8, this Cometic Multi-Layer Steel (MLS) head gasket is a solid choice. It's specifically made for these large displacement V8 engines and features a 4.450-inch bore with a .040-inch undersize, designed for the left-hand side (LHS) of the engine. This gasket is built to handle the demands of high-output engines, ensuring a strong seal between your cylinder head and engine block.

Cometic uses 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, meaning you won't need any extra sealants. The center layer is also stainless steel and can be varied to achieve different thicknesses, like the 0.098-inch compressed operating thickness on this gasket. This construction is ideal whether you're mating aluminum heads to aluminum blocks or aluminum heads to cast iron blocks, as it can manage the shearing forces that occur between different metals.

This gasket fits a range of popular GM trucks and SUVs from the early 2000s, including models like the Chevrolet Silverado 2500 HD and GMC Yukon XL 2500. It's a well-built component designed for reliable sealing in demanding applications.