Cometic 55-58 Chrysler 318 V8 4.030in Bore .040in MLS Head GasketCOMETIC MLX (Multi Layer Stopper) gaskets utilize an integrated stopper layer for combustion chamber sealing and improved clamp load around the cylinder without increasing bore distortion. MLX technology can be found in some head gaskets and are made from the same materials as our MLS Head Gaskets. No sealants or re torque required. This Part Fits: Year Make Model Submodel 1958 Plymouth Belvedere Base 1958 Plymouth Custom Base 1957 1958 Plymouth Fury