Cometic Chevrolet Mark-IV - GM Gen-V/VI Big Block V8 .075in MLS Cylinder Head Gasket - 4.630in Bore

When you're rebuilding the top end of a big block Chevrolet Mark IV or GM Gen V/VI V8, getting the cylinder head sealing right is critical. This Multi-Layer Steel (MLS) head gasket from Cometic is built to handle the demands of high-output engines, whether you're working with aluminum heads on aluminum blocks or aluminum heads on cast iron blocks. The MLS construction offers increased strength and resistance to corrosion, thanks to its multiple stainless steel layers.

Each outer layer of this gasket is embossed and coated with Viton, a heat-resistant rubber material that can handle temperatures up to 482 degrees Fahrenheit. This coating ensures a reliable seal even under tough conditions. The center layer is uncoated stainless steel, and its thickness is varied to meet different requirements – in this case, a compressed operating thickness of 0.075 inches with a 4.630-inch bore. These gaskets are designed for aftermarket heads and feature undersized water ports, allowing for customization during installation.

This gasket fits a wide range of vehicles, including popular models like the Chevrolet Impala, C10 Pickup, and Corvette from various years. Because they require no additional sealants, installation is straightforward, making them a solid option for serious engine builds.