ARP's Custom Age 625 Plus material is 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 psi.

No Modification to your cylinder head or block is required as these are a direct drop-in replacement for the OEM head stud!

• Yield Strength: 235-255,000 PSI
• Tensile Strength: 260,000 PSI