External Oil Pump, Single Stage, V-Band Mounting Clamp To Mount External Oil Pump To Alston Front Drives, 1.800 Pressure Section. This is a made to order part, please contact our Tech Department at (203-458-0546) for assistance. Fits: Alston Front Accessory Drives External pumps eliminate the spark scatter and camshaft loads that come with an internal pump V-Band mounting flange to mount External Oil Pump to Alston front drives Spur gear 1.800 pressure section Light weight and efficient Includes all replacement fittings, -16AN inlet, -12AN outlet External oil pumps run cooler than internal pumps and features an external bypass for ease of adjustment