ARP Head Stud Kit, Cummins 4BT 3.9L, ARP625 Custom Age

If your building a high horsepower engine you need to start with the strong foundation, ARP (Automotive Racing Products) is known for their quality fasteners.

Running a big single turbo or twins? Head studs are a must if you are pushing in excess of 45psi of boost. Why take the chance of ruining your day at the track or worse, doing permanent engine damage.

With performance enthusiasts adding increasing amounts of turbo boost to diesel applications, ARP has provided an extra measure of security in the form of extra-strong head studs manufactured from the firm's proprietary Custom Age 625+(R) material that has a minimum rating of 260,000 psi tensile strength. They are engineered to provide the clamping force required to keep cylinder heads from lifting due to exceptionally high combustion pressures.