Cometic GM L18 Vortec 8100 Gen-VII Big Block V8 .120in MLS Cylinder Head Gasket - 4.280in Bore - LHS

Cometic Gasket is a well-known name for creating robust sealing solutions, and this Multi-Layer Steel (MLS) head gasket is built to handle the demands of high-output engines like the GM L18 Vortec 8100 Gen-VII Big Block V8. This gasket is designed for the left side of the engine and features a 4.280-inch bore, making it suitable for a range of heavy-duty trucks and SUVs including the Chevrolet Silverado 2500 HD and GMC Sierra 3500 from the early 2000s.

This gasket is constructed from multiple layers of stainless steel for increased strength and resistance to corrosion. The outer layers are embossed and coated with Viton, a heat-resistant rubber material that can handle temperatures up to 482°F (250°C) and works well in harsh sealing environments. The center layer is stainless steel and can be varied to achieve different thicknesses; this particular gasket has a compressed operating thickness of 0.140 inches, starting from a 0.120-inch base. MLS gaskets are ideal for mating aluminum heads to either aluminum or cast iron blocks, as they can manage the shearing forces between different metals without needing additional sealants.