Cometic Chevrolet Mark-IV - GM Gen-V/VI Big Block V8 .140in MLS Cylinder Head Gasket - 4.630in Bore

Cometic Gasket is known for making well-built sealing components, and this Multi-Layer Steel (MLS) head gasket is a prime example for your Chevrolet Mark-IV or GM Gen-V/VI Big Block V8 engine. Designed for high-output applications, this gasket helps ensure a solid seal between your cylinder head and engine block, which is crucial for maintaining compression and preventing coolant and oil leaks. It's built to handle the demands of powerful engines, making it a solid option for rebuilds or performance upgrades.

This gasket uses a multi-layer steel construction, giving it increased strength and the ability to rebound, which helps resist corrosion and maintain its seal over time. The outer layers are coated on both sides with Viton, a heat-resistant rubber material that can handle temperatures up to 482 degrees Fahrenheit and works well in tough sealing environments. The center layer is stainless steel and can be varied to achieve different thicknesses; in this case, it's set to a compressed thickness of 0.036 inches with an overall gasket thickness of 0.140 inches. This particular gasket features undersized water ports, which is a detail often found on gaskets intended for aftermarket heads, allowing for customization during installation.

This gasket fits a wide range of vehicles, including popular models like the 1965-1975 Chevrolet Bel Air, 1968-1980 Chevrolet C10 Suburban, and 1965-1976 Chevrolet Impala, among many others. Because it's an MLS gasket, it doesn't require any sealants and is suitable for use with both aluminum and cast iron blocks, and aluminum heads.