Many an engine has been destroyed as a result of oil pump driveshaft failure. To cure this all-too-common problem, ARP has designed an extra heavy-duty shaft that will provide you with the necessary reliability. The shaft is made from heat-treated, premium grade aerospace chrome moly steel. Moreover, the shaft diameter is a larger diameter than the OEM unit. These features combine to enable ARP shafts to handle the added torque requirements of increased capacity oil pumps or heavy viscosity lubricants. FORD DRIVES: Made from ARP2000 and heat-treatedto 220, 000 psi. These pump drives feature a CNC milled (not broached) hex, and has the retaining washer installed. IMPORTANT NOTE: Make sure you ALWAYS check clearances: shaft to block and pump to distributor.