Cometic Chevy BB 4.540in Bore .051 inch MLS 396/402/427/454 Head Gasket

When you're rebuilding a Chevrolet Big Block Mark IV V8, you'll get a set of Cometic Multi-Layer Steel (MLS) head gaskets in this package. These gaskets are built with multiple layers of stainless steel, giving them increased strength and the ability to rebound, which helps them resist corrosion. The outer layers are coated with Viton, a heat-resistant rubber material that can handle tough sealing conditions and various surface finishes, making them suitable for both aluminum and cast iron blocks. The compressed operating thickness is 0.051 inches, and they are designed for a 4.540-inch bore size.

These MLS gaskets are a solid choice for high-output engines because they provide maximum sealing performance without needing any additional sealants. The multi-layer stainless steel construction also means they can handle the shearing forces that can occur between different block and head materials, like aluminum heads on cast iron blocks. The center layer is stainless steel and can be varied to achieve different thicknesses, like the 0.051 inches found in this specific gasket.

This gasket fits a wide range of Chevrolet vehicles from the mid-60s through the early 80s, including models like the Impala, Chevelle, and C10 Pickup. Always refer to the manufacturer's installation instructions for proper fitment and procedure.