Cometic Chevy BB Gen IV 396/402/427/454 H/G 4.320 inch Bore .030 inch MLS Head Gasket

Cometic Gasket is well-known for its multi-layer steel (MLS) head gaskets, built to handle the demands of high-output engines. This particular gasket is designed for Chevrolet Mark IV Big Block V8 engines with a 4.320-inch bore and a compressed thickness of .030 inches. It's a solid option for rebuilding your top end, whether you're working with aluminum heads on aluminum blocks or aluminum heads on cast iron blocks, as the multi-layer steel construction can handle the shearing forces between different metals.

The construction features multiple embossed layers of stainless steel. The outer layers are coated with Viton, a heat-resistant rubber material that can handle temperatures up to 482°F and various sealing environments. The center layer is uncoated stainless steel, allowing for precise thickness control. These gaskets are designed to provide maximum sealing performance without needing additional sealants, making installation more straightforward. They offer increased strength and resist corrosion, helping to ensure a reliable seal for your engine.

This gasket fits a wide range of Chevrolet vehicles from the mid-60s through the early 80s, including models like the C10 Pickup, Impala, and Camaro, making it a versatile choice for many Big Block projects.