Cometic Chevy BB 4.375in Bore .066 inch MLS 396/402/427/454 Head Gasket

This Cometic Multi-Layer Steel (MLS) head gasket starts with a compressed thickness of 0.066 inches and features a 4.375-inch bore, making it a solid choice for rebuilding or repairing GM Gen-V/VI Big Block V8 engines. These gaskets are constructed from multiple embossed layers of stainless steel, with the outer layers treated with a heat-resistant Viton rubber coating. This advanced construction is designed to handle the high output of modern engines and provides excellent sealing performance without needing additional sealants, whether you're pairing aluminum heads with aluminum blocks or aluminum heads with cast iron blocks. The multi-layer design offers increased strength and resistance to corrosion, while the Viton coating can withstand harsh sealing environments and high temperatures up to 482°F (250°C).

The unique construction of these MLS gaskets allows them to rebound and resist the shearing forces that can occur between different metal types, like aluminum and cast iron. The center shim layer is uncoated stainless steel and can be varied to achieve different thickness requirements, though this specific gasket is set at 0.066 inches compressed. This well-built gasket is ideal for a wide range of Chevrolet and GMC trucks and vans from the early 90s, including models like the C1500, C2500 Suburban, and K3500, ensuring a reliable seal for your engine's top end.