Cometic BB 4.630in Bore .066 inch MLS-5 396/402/427/454 Head Gasket

This listing is for a Cometic BB 4.630 inch bore, .066 inch thick Multi-Layer Steel (MLS) head gasket. It's designed for Chevrolet Mark IV Big Block V8 engines and fits a wide range of vehicles from the mid-60s through the early 90s, including models like the Chevrolet Impala, C10 Pickup, and Corvette.

Cometic's MLS head gaskets are built with multiple layers of stainless steel for 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°F (250°C). This construction makes them ideal for sealing between aluminum heads and either aluminum or cast iron blocks, as they can manage the shearing forces that arise from these material combinations. The center layer is stainless steel and can be varied in thickness to meet different requirements, with this specific gasket having a compressed thickness of .066 inches.

These gaskets are designed to provide maximum sealing performance for high-output engines and do not require additional sealants. The embossed outer layers and Viton coating ensure a reliable seal in demanding conditions.