ARP Pro Series main bolts are application-specific and rated at 190,000 psi. Designed for use in competition engines, as well as to meet the exacting standards and demands of professional engine builders, ARP bolts are forged from 8740 chromoly steel and feature a reduced wrenching head, large underhead radius, and rolled threads for the utmost in reliability. The threads are rolled after heat-treating which gives them about 2,000 percent better fatigue strength than most main bolts that are threaded prior to heat-treating. Hardened parallel-ground washers are included with each kit.
Made using premium grade 8740 alloy materials that deliver superior fatigue cycle life
Each stud is placed vertically in special racks
Heat treated to 200,000 psi
Thread-rolled to provide 1000% better fatigue strength
Resistance to atmospheric corrosion and oxidation
Includes (10) head studs (long)
Includes (4) short studs
Includes (10) washers
includes (1) ARP Ultra-Torque fastener assembly lubricant