We got a set of Cometic Gasket’s MLX head gaskets for a small block Ford build we’re doing. Our head gaskets are a standard layout Ford head gasket with a .040″-.044″ thickness and designed to fit a 4.125″ bore. The difference between an MLS and Cometic’s MLX gasket, which stands for Multi-Layer-Xtreme, is an extra ‘stopper’ fold-over layer that provides a torque limiting surface and prevents yielding of the combustion seal. Check out the rest of the review.