Cometic Chevrolet 348/409 W-Series Big Block V8 .027in MLS Cylinder Head Gasket - 4.375in Bore

This Cometic Multi-Layer Steel (MLS) head gasket is built with multiple embossed layers of stainless steel, featuring an outer layer coated with Viton rubber. This construction is designed to handle the demands of high-output engines, offering excellent sealing performance without the need for additional sealants. It's a solid choice for applications using aluminum heads with either aluminum or cast iron blocks, as it can effectively manage the shearing forces that can occur between dissimilar metals.

The Viton coating on the outer layers is a heat-resistant material capable of withstanding temperatures up to 482 degrees Fahrenheit, making it suitable for harsh sealing environments and various surface finishes. The center layer is uncoated stainless steel, and its thickness can be varied to meet different engine build requirements. This particular gasket has a bore size of 4.375 inches and a compressed operating thickness of 0.036 inches, with an initial thickness of 0.027 inches, making it a precise fit for specific big block Chevrolet W-Series engines.

This gasket fits a range of classic Chevrolet vehicles, including models like the Impala, Bel Air, and C10 Pickup from the late 1950s and early 1960s. Its robust construction ensures it can handle the stresses of these powerful V8 engines.