Cometic Chevrolet 348/409 W-Series Big Block V8 .040in MLS Cylinder Head Gasket - 4.437in Bore

If you're working on a Chevrolet 348 or 409 W-Series big block V8, this Cometic Multi-Layer Steel (MLS) cylinder head gasket is built to handle the job. It's designed with a 4.437-inch bore and a compressed thickness of 0.040 inches, making it a precise fit for these classic engines. These gaskets are a popular choice for rebuilding high-output engines because they offer a robust seal without needing any additional sealants.

This gasket is constructed from multiple layers of stainless steel, which gives it increased strength and the ability to rebound, helping it resist corrosion. The outer layers are coated with Viton, a heat-resistant rubber material that can handle temperatures up to 482 degrees Fahrenheit. This makes it suitable for sealing between aluminum heads and either aluminum or cast iron blocks, as it can withstand the forces created by dissimilar metals. The center layer is uncoated stainless steel, allowing for variations in thickness to meet specific engine requirements.

This gasket fits a range of Chevrolet vehicles from the late 1950s and early 1960s, including models like the Impala, Bel Air, and C10 Pickup. It's a well-built component designed for reliable performance in these iconic V8 engines.