Aeromotive Atomic hex drive fuel pumps feature a hex drive shaft and mounting collar designed to be mounted and driven directly from the back of a properly prepared external oil pump or by the cam through a timing cover adapter. Offering the convenience of direct drive, these fuel pumps flow in excess of 4,500 lbs. per hour! They utilize a standard 3/8 in. hex drive shaft and an adjustable billet mounting collar with a standard 3-bolt mounting pattern and hardware. They feature removable ports with a 1.25 in. inlet and an ORB-12 outlet port. Aeromotive Atomic hex drive fuel pumps will support over 5,000 hp gas and 2,500 hp methanol. These pumps are constructed with a 6061 T6 aircraft aluminum alloy housing and are Type III hard coat anodized for durability.