ARP Custom Age Head Stud Kit

The ARP Custom Age 625+ Head Stud Kit line gives high-horsepower, forced-induction and competition engines a stronger alternative to factory head bolts. These cylinder head studs are made from ARP's Custom Age 625+ super-alloy. They provide the clamping force needed to keep the head gasket sealed and the cylinder head from lifting under extreme combustion pressure.

Key Features:

• Custom Age 625+ super-alloy: a high-strength chromium-cobalt nickel alloy with typical tensile strength of 260,000-280,000 psi and yield strength of 235,000-255,000 psi
• Higher strength than common upgrade materials: stronger than Chrome Moly 8740 and ARP 2000
• Fatigue and corrosion resistance: good fatigue cycle life, with resistance to atmospheric corrosion and oxidation
• Precision manufacturing: the studs are heat-treated before the threads are rolled, then centerless ground for concentricity
• Complete hardware: kits are built around studs, nuts and washers, with contents varying by application
• Re-usable alternative to torque-to-yield bolts: TTY bolts are designed to be replaced, so studs suit engines that are rebuilt or tuned for more power

ARP is a well-known maker of high-performance fasteners. Its head stud kits help reduce head lift and head gasket failure in turbocharged, supercharged, nitrous and other high-load builds. Each kit is made for a specific application, so choose the part number that matches your engine.