Cometic AMC 390 70 / 401 72-74 4.250in Bore .040 inch MLS Head Gasket

This listing is for a Cometic Multi-Layer Steel (MLS) head gasket, specifically designed for AMC 390 and 401 Gen-3 V8 engines. It features a 4.250 inch bore and a compressed thickness of .040 inch. This gasket is built to handle the demands of high-output engines and is suitable for applications using aluminum heads with either aluminum or cast iron blocks, as it can manage the shearing forces between dissimilar metals.

The gasket is constructed from multiple layers of stainless steel for increased strength and resistance to corrosion. The outer layers are embossed and coated with Viton, a heat-resistant rubber material capable of withstanding temperatures up to 482 degrees Fahrenheit. This coating ensures a reliable seal even in harsh conditions and across various surface finishes. The center layer is uncoated stainless steel, allowing for precise thickness control. These MLS gaskets do not require any additional sealants for installation.

This head gasket fits a wide range of American Motors and Jeep vehicles from the late 1950s through the early 1990s, including models like the Jeep CJ series and American Motors Ambassador. Ensure you check the full fitment list to confirm compatibility with your specific vehicle.