ARP has designed these extra heavy-duty shafts to provide you with the necessary reliability. The shafts are made from a heat treated chromemoly steel. They are larger in diameter than the OEM unit, enabling the ARP shafts to handle the added torque requirements of increased oil pump capacity or heavy viscosity lubricants. Rated at 190,000 psi, these ARP oil pump driveshafts are ready to do the job.