ARP Custom Age 625+ Head Stud Kit to suit Nissan Skyline R32 GTR, R33 GTR & R34 GTR - RB26DETT.

Custom Age 625 Plus©: This newly formulated super-alloy demonstrates superior fatigue cycle life, tensile strength and toughness - with complete resistance to atmospheric corrosion and oxidation. ARP is the first to develop manufacturing and testing processes for fasteners with Custom Age 625+. Best of all it is less expensive and expected to soon replace MP-35 as the material of choice in the high strength, super-alloy field. Typical tensile strength is 260,000-280,000 psi.