Cometic BB 4.630in Bore .098in Chevy Mark IV Big Block (396 / 402 / 427) MLS Head Gasket

This listing is for one Cometic Multi-Layer Steel (MLS) head gasket, designed for Chevrolet Mark IV Big Block V8 engines. It features a 4.630-inch bore and a compressed thickness of 0.098 inches. These gaskets are built with multiple layers of stainless steel, with the outer layers coated in Viton, a heat-resistant rubber material. This construction helps ensure a strong seal, even with aluminum heads on cast iron blocks, and they are designed to work without needing additional sealants.

The multi-layer steel design offers increased strength and resistance to corrosion, while the Viton coating on the outer layers handles demanding sealing environments. The center stainless steel layer can be varied to achieve different thickness requirements, making these gaskets suitable for high-output engines. They fit a wide range of Chevrolet vehicles from the mid-60s through the mid-80s, including models like the Impala, Chevelle, and C10 Pickup.