Cometic GM 2017+ LP5 Duramax .060in MLX Cylinder Head Gasket - 4.161in BoreCOMETIC 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 2017 2020 Chevrolet Silverado 2500 HD High Country 2017 2020 Chevrolet