Cometic Chevrolet Mark-IV - GM Gen-V/VI Big Block V8 .056in 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 crucial. This Multi-Layer Steel (MLS) head gasket from Cometic is built to handle the demands of high-output engines, ensuring a solid seal between your block and heads without needing extra sealants. It's designed to work well with both aluminum and cast iron blocks, and can handle the stresses that come from different metal combinations.

This gasket is constructed from multiple layers of stainless steel, which gives it increased strength and resistance to corrosion. The outer layers are coated with Viton, a heat-resistant rubber material that can handle temperatures up to 482 degrees Fahrenheit and works well in tough sealing situations. The center layer is stainless steel and can be varied in thickness; this particular gasket has a compressed thickness of 0.036 inches and an overall bore size of 4.630 inches. It's also noted for having undersized water ports, which is helpful when using aftermarket heads, as it allows for custom fitting to your specific setup.

This gasket fits a wide range of classic GM vehicles, including models like the 1965-1975 Chevrolet Bel Air, 1968-1986 Chevrolet C20, and 1975-1976 Chevrolet G30. It's a well-built component designed for reliable performance in performance engine builds.