Cometic GM L18 Vortec 8100 Gen-VII Big Block V8 .070in MLS Cylinder Head Gasket - 4.350in Bore - RHS

This is a Cometic Multi-Layer Steel (MLS) cylinder head gasket designed for GM L18 Vortec 8100 Gen-VII Big Block V8 engines. It features a 4.350-inch bore and a compressed thickness of 0.098 inches, making it suitable for a range of heavy-duty Chevrolet and GMC trucks and SUVs from the early 2000s, like the Chevrolet Silverado 2500 HD and GMC Sierra 3500.

MLS head gaskets are built with multiple layers of stainless steel for increased strength and resistance to corrosion. The outer layers of this gasket are coated on both sides with Viton, a heat-resistant rubber material that can handle temperatures up to 482°F (250°C). This coating ensures a strong seal without needing additional sealants, and the multi-layer design helps manage the forces between aluminum heads and cast iron blocks.

The center layer is uncoated stainless steel and can be varied to achieve different thicknesses, like the 0.070-inch specification on this particular gasket. This construction makes it a solid option for high-output engines where reliable sealing is critical.