These ARP High Performance series connecting rod bolts are made from seamless and defect-free 8740 chromoly steel. All ARP rod bolts are heat-treated before grinding and thread rolling and have a large underhead radius for greater strength.
A large number of connecting rod manufacturers have chosen ARP bolts as standard equipment. They're proud to advertise their products as being equipped with ARP rod bolts.
Pontiac 151 cid (Iron Duke) 4-cylinder 11/32 ARP 191-6001 Connecting Rod Bolts, High Performance Series, 8740 Chromemoly Steel. ARP Hi-Performance Connecting Rod Bolts are 190,000 PSI.