Cometic GM Gen II / Mark IV Big Block (396 / 402 / 427) 4.630in Bore .075in MLS-5 Head Gasket

If you're rebuilding the top end of your GM Gen II or Mark IV Big Block engine, like a 396, 402, or 427, a solid head gasket is crucial for sealing. This Multi-Layer Steel (MLS) gasket from Cometic is built to handle the demands of high-output engines and fits a wide range of Chevrolet vehicles from the mid-60s to the late 70s, including models like the Impala, Chevelle, and C10 Pickup.

Cometic's MLS gaskets use 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 tough sealing environments and varying surface finishes, meaning you don't need additional sealants. The center layer is stainless steel and can be varied to achieve different thicknesses; this particular gasket has a compressed thickness of 0.075 inches and a bore size of 4.630 inches, making it suitable for both aluminum and cast iron blocks.