Cometic Chevrolet Mark-IV - GM Gen-V/VI Big Block V8 .089in MLS Cylinder Head Gasket - 4.630in Bore

This listing is for a Cometic Multi-Layer Steel (MLS) cylinder head gasket designed for Chevrolet Mark-IV and GM Gen-V/VI Big Block V8 engines. It features a 4.630-inch bore and a compressed thickness of .089 inches. This gasket is constructed from multiple layers of stainless steel, with the outer layers coated in Viton, a heat-resistant rubber material. The multi-layer design offers increased strength and resistance to corrosion, making it suitable for high-output engines and for use with both aluminum and cast iron blocks.

The Viton coating on the outer layers is designed to handle harsh sealing environments and various surface finishes, while the center stainless steel layer can be varied for different thickness requirements. This particular gasket has undersized water ports, which allows for customization when used with aftermarket cylinder heads. It is designed to provide maximum sealing performance without the need for additional sealants.

This gasket fits a wide range of Chevrolet vehicles from the mid-1960s through the mid-1980s, including models like the Chevrolet Impala, C10 Pickup, and Corvette. It's a well-built option for rebuilding or upgrading your big block V8 engine.