It is for good reason that virtually every top professional engine builder relies on ARP Pro Series head studs for their all-out competition powerplants. Simply stated, there's not a better stud setup on the market today.
ARP - The world leader in fastener technology has just released a new Custom Age 625+® head stud kit for 1989 and later Subaru (EJ Series) DOHC 4-cylinder applications.
Part No. 260-4704 - includes a set of twelve Custom Age 625+® head studs, twelve parallel ground washers, twelve 8740 chrome moly steel 12 point nuts and a 1/2 oz. pack of ARP Ultra- Torque fastener assembly lubricant.
All Custom Age 625+® studs are centerless ground, heat treated prior to thread rolling and ma- chining, and are nominally rated at 270,000 psi. These fasteners deliver a 55% increase in tensile strength and are reusable as compared to the OEM Torque to Yield (TTY) head bolts.