Cummins 5.9 and 6.7L engines gain superior performance, durability and style with Carrillo HD Billet Rods featuring Cap Relief and 7/16" ARP Bolts. The rods are crafted from billet steel and equipped with large diameter lifter bosses, granting them enhanced flexural strength under load. Further, 7/16" ARP Bolting ensures superior strength and reliability compared to other higher performance Cummins engines. Benefit from smoother, stronger and longer-lasting engine performance with Carrillo HD Billet Rods.