Cometic GM LT1/L86/L87 4.125in Round Bore .58in MLX 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 2020 Chevrolet Camaro LT 2020 2021 Chevrolet Camaro LT1 2016 2021 Chevrolet