Cometic AMC 390/401 Gen-3 V8 .045in MLS Cylinder Head Gasket - 4.250in Bore

This is a Cometic Multi-Layer Steel (MLS) cylinder head gasket designed for AMC 390 and 401 Gen-3 V8 engines. It features a 4.250-inch bore and a compressed thickness of 0.045 inches. MLS head gaskets are a popular choice for rebuilding or upgrading engines that see higher output, as they offer a robust sealing solution that doesn't require additional sealants.

Cometic builds these gaskets 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 tough sealing environments and various surface finishes. This construction makes them suitable for applications with aluminum heads on either aluminum or cast iron blocks, as they can manage the shearing forces that can occur between different metals. The center layer is stainless steel and can be varied in thickness to meet different engine build requirements.

This gasket is a solid option for many American Motors and Jeep vehicles from the late 1960s through the early 1990s. It's designed to provide reliable sealing for your engine's top end.