Fel-Pro® gaskets offers 100 Percent vehicle sealing with application-specific materials to give you sealing solutions with the performance and durability professionals trust. PermaTorque MLS Designed specifically for the aftermarket repair environment, PermaTorqueMLS gaskets feature full-hard stainless steel that maintains its shape and compensates for thermal expansion and motion between the block and head, while their strategically placed sealing beads eliminate leak paths.