Cometic Chevrolet Mark-IV - GM Gen-V/VI Big Block V8 .036in MLS Cylinder Head Gasket - 4.630in Bore

Starting with a compressed operating thickness of 0.036 inches, this Cometic Multi-Layer Steel (MLS) head gasket is built for serious performance. It's designed for Chevrolet Mark-IV and GM Gen-V/VI Big Block V8 engines, and its 4.630-inch bore is suitable for aftermarket heads, featuring undersized water ports that allow for customization to your specific build.

Cometic's MLS design uses multiple layers of stainless steel for increased strength and corrosion resistance. The outer layers are coated with Viton, a heat-resistant rubber material that can handle temperatures up to 482°F and works well with aluminum heads on either aluminum or cast iron blocks. This construction means the gasket seals effectively without needing additional sealants, and it's built to withstand the forces generated by different metal combinations.

This gasket fits a wide range of GM vehicles from the mid-60s through the early 90s, including popular models like the Chevrolet Impala, Corvette, and C10 Pickup. It's a solid option when you're rebuilding the top end of your big block V8 and need a reliable seal for high-output applications.