Cometic Chevrolet Mark-IV Big Block V8 .140in MLS Cylinder Head Gasket - 4.540in Bore

When you're rebuilding the top end of your Chevrolet Mark-IV Big Block V8, a solid head gasket is crucial for sealing combustion pressure and coolant. This Multi-Layer Steel (MLS) gasket from Cometic is built to handle the demands of high-output engines, offering a robust seal without needing additional sealants. It's designed to work well with both aluminum and cast iron blocks, accommodating the potential for shearing forces between different metals.

Cometic constructs this gasket using 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 capable of withstanding temperatures up to 482°F (250°C). This coating ensures a reliable seal across various conditions and surface finishes. The center layer is uncoated stainless steel, and its thickness can be varied to meet specific requirements, with this particular gasket set to a compressed operating thickness of 0.140 inches and a bore size of 4.540 inches.

This gasket fits a wide range of Chevrolet vehicles from the mid-60s through the early 80s, including popular models like the Impala, Chevelle, and C10 Pickup. It's a well-built component designed for reliable performance in demanding applications.