Moroso billet aluminum spur gear oil pumps feature special anti-cavitation slots, feeder grooves and an enlarged bypass area that are machined into the housing to bleed oil back to the inlet side of the pump. They combine to offer a smooth and consistent flow of oil, which improves the oil pumps overall performance, extends engine life and places an even loading on the distributor shaft to eliminate spark scatter. The pumps housing is machined from billet alum and anodized for corrosion protection and pump durability.
The gear and inner rotor shaft assemblies are matched to maintain absolute minimum clearances and provide maximum volumetric efficiency. Oil pump gears are supported by a thrust bearing assembly that will increase oil pump housing and spur gear life due to drive shaft axial forces on the drive gear not being subjected to side-load.
Oil pump is considered hi-volume and hi-pressure, perfect for race motors. Pump has a perforated pick-up that bolts on to the bottom of the oil pump, measures 2.750" x 1.00" that allows plenty of oil flow to the engine. Oil pump is designed to clear up to 4.750" stroke on the crankshaft. One more cool feature is oil pump assm. weights one pound less than a stock BBC cast iron oil pump. Includes detailed installation instructions.
Oil pump is used with Moroso part #20401, #20408, #20411, #20413, #21047, #21048, #21245 and #21049 Chevrolet Big Block oil pans.
Big Block Chevy Oil Pumps (Cast & Billet):
Heavy pressure spring – Brown Color – 70 to 80 p.s.i. (At operating temperatures)
Medium pressure spring – Purple Color – 60 to 70 p.s.i. (At operating temperatures)
Light pressure spring – Blue Color – 50 to 60 p.s.i. (At operating temperatures)
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