Depending on the trucks set-up, upgrading to a set of these A1 Technologies H11 head studs is always recommended at boost levels above 38-40-psi. These are the best head studs available on the market today for the Power Stroke and the same studs we run in our shop race truck (100+ psi boost). A1 Technologies is the industry leader in fasteners offering studs for NHRA and Nascar