ARP Cylinder Head Stud Kit - 4A-GE 20 Valve EnginesARP Cylinder Head Stud Kit Applications include 4A GE 20 Valve Engines The ARP Cylinder Head Stud Kit is a must have when pushing performance in high boost turbocharged or high compression engine builds. Unlike OEM head studs, the ARP bolts are reusable and do not stretch. They can be used with all our metal headgaskets. ARP is the market leader in fasteners and bolts for racing and high performance engines. ARP's Top quality, exact tolerances, and