A combination of the engine’s design only incorporating four head fasteners per cylinder (most diesels employ six) and those fasteners being torque-to-yield head bolts is to blame for most of the 6.0L’s head gasket issues. Under extreme operating conditions, the head bolts stretch beyond their elastic limit and the head(s) lifts as a result. Here you can see two factory head bolts on the left and two ARP head studs (PN 250-4202) shown on the right. Unlike bolts, head studs thread completely into the block and provide superior head-to-block clamping force. ARP’s success rate can best be measured by the simple fact that once 6.0L engines are fitted with a set of its studs, they rarely ever pop a head gasket again, even at higher horsepower levels. It’s no wonder why this is the best-selling fastener in ARP’s arsenal.