Cometic Chrysler 7.0L Gen-3 HEMI Drag Pak Head 4.200in Bore .054in MLX WTR PORT Right 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 1963 Chrysler 300 Base 1963 Chrysler 300 Sport 1970 1971 Dodge Challenger Base