ARP Powerstroke 6.7L Head Stud Kit. ReBuilding You Powerstroke? Or trying to boost performance on your 6.7L Powerstroke? Or simply want to keep your cylinder heads in place, a set of ARP 250-4301 Head Studs is the way to go. These studs are crafted from ARP's proprietary ARP 2000 material and are rated at an impressive 220,000 psi tensile strength, meaning they can handle whatever you throw at them. Installation is simple and they're direct replacements for the factory head bolts, so you can rest easy knowing your engine is in good hands. Make sure your engine is up to the task with a set of ARP 250-4301 Head Studs.