The main stud kit feature premium grade ARP2000® material that is rated at 220,000 psi tensile strength and the cam tower bolt kit features premium grade 8740 material that is rated at 200,000 psi tensile strength. Each kit includes the necessary bolts or studs, premium grade chrome moly nuts and washers for the application and a 1/2 oz. pack of ARP Ultra-Torque fastener assembly lubricant. ARP fasteners are centerless ground, heat treated prior to thread rolling and machining and designed to exceed the OEM fasteners in strength and durability. Optimum design, enhanced reliability and increased strength are the main attributes of ARP’s Pro Series fastener kits.