ARP Main Stud Kit , 5.9L/6.7L (2004-2007) 5.9L(with Factory Girdle) Also called, factory block stiffener plate.


The industry gold-standard ARP diesel head stud is made from ARP’s proprietary ARP2000 material. This metal is tensile strength rated at 220,000 psi. In addition to phenomenal temperature stability, ARP2000 has excellent notch toughness. Also, ARP Ultra-Torque Fastener Assembly Lubricant is Included with this kit.

ARP diesel head studs are manufactured in ARP’s Santa Paula, CA plant from proprietary ARP 2000 material, with threads rolled after heat-treat to provide optimum fatigue strength. The ARP Bolts are centerless ground to assure perfect concentricity. The ends of the arp bolts head studs are broached to facilitate easy installation. This feature also enables the cylinder head to be removed in tight quarters. Also included in each ARP Bolt kit are heat-treated, chrome-moly steel 12-point nuts and parallel-ground washers. The ARP Bolts are black oxide finished for extra durability.

In order to ensure optimum quality control for their head studs, bolts, and other products, ARP has grown to be exceptionally self-reliant and now controls all aspects of the manufacturing process. All operations on bolts, head studs, and other products are performed in-house and closely monitored. This is how ARP has been able to establish a reputation for “zero defects” quality for its bolts, head studs, and other products.