The ATS Fire Ring Kit for allows for great performance and huge boost levels while helping protect your head gasket. This kit covers cleaning and inspection of both heads as well as all required machining, including decking each head to ensure theyre completely flat and cutting of the grooves. This kit also includes a new set of head gaskets that are precision-cut around our exclusive fire rings, which set in the grooves we machine into the head and are "crushed" against the block to provide the most reliable seal available for the 6.0L Powerstroke! High-torque head studs are required for most effective operation as they will help prevent the head from lifting & causing gasket failure. This is the single most effective solution for head gasket failures available today!