These head stud kits feature premium grade ARP CA625 material that is rated at 260-280 000 psi tensile strength.
These are a direct replacement for the OEM head bolts. No drilling and tapping of the cylinder block required.
This kit includes a set of fourteen ARPCA625+® M12 head studs that replace the original head bolts, fourteen parallel ground washers, fourteen chrome moly steel 12 point nuts and a 1/2 oz. pack of ARP Ultra-Torque fastener assembly lubricant.
The pro series kits are also available with 12-point nut, and all kits come complete with hardened parallel washers for an even load distribution and accurate torque readings.
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.
