Cometic Chevy Mark-IV Big Block V8 .040in MLS Cylinder Head Gasket - 4.500in Bores

This is a Cometic Multi-Layer Steel (MLS) head gasket designed for Chevrolet Mark IV Big Block V8 engines. It's built with a .040 inch thickness and is intended for engines with 4.500 inch bores. The gasket features valve pocketed bores, meaning there's extra clearance around the valve areas to prevent interference. This gasket fits a wide range of Chevrolet vehicles from the mid-60s through the mid-80s, including popular models like the Impala, C10 Pickup, and Corvette.

The key to this gasket's performance is its HP shim technology. This design increases the clamping force around the combustion chamber, which is especially important for open deck blocks like those found in many Mark IV engines. This improved sealability helps prevent leaks and ensures consistent performance under pressure. The outer layers of the gasket are embossed and coated with Viton, a material known for its resistance to heat and oil, further enhancing its sealing capabilities and durability.