ARP Pro Series Custom Age 625+ cylinder head studs are cold-forged to ensure molecular integrity. They're heat-treated prior to thread rolling and machining. ARP Pro Series kits are also available with 12-point nuts, and all studs come complete with hardened parallel washers for an even load distribution and accurate torque readings.
With a high tensile strength of 260,000-280,000 psi, these studs can keep the cylinder head from lifting, pressurizing the cooling system ,and preventing damaging to the head gasket.
Recommended for power levels exceeding 700+ HP