5.9L 12v 6 cylinder Cummins MLx Cylinder Head Gasket. 4.188 Gasket Bore. Stopper layer to withstand additional cylinder pressures of diesel engines. Compressed operating thickness is .061. Each Description COMETIC 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. Vehicle Application Domestic Auto Cummins 5.9L Cummins 12V