Cometic Chevrolet Mark-IV Big Block V8 4.630in Bore .051 MLS Cylinder Head Gasket

When you're rebuilding the top end of your Chevrolet Mark-IV Big Block V8, getting the head gaskets seated right is crucial for sealing combustion and coolant. This Multi-Layer Steel (MLS) gasket from Cometic is built to handle the pressures of high-output engines without needing any extra sealants.

Cometic uses multiple layers of stainless steel for strength and corrosion resistance, with embossed outer layers coated in Viton, a heat-resistant rubber material that can handle temperatures up to 482°F. This construction is ideal for mating aluminum heads to either aluminum or cast iron blocks, as it can manage the different expansion rates and shearing forces between those materials. The compressed thickness on this particular gasket is 0.051 inches, with a 4.630-inch bore, designed to match your specific engine configuration.

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. Make sure to check the full fitment list to confirm it's the right part for your project.