Abstract: An oil flow restrictor system (100) is provided for increasing the oil pressure to the main bearings of a V-block engine internal combustion engine (10) while simultaneously restricting the flow of oil independently to the left lifter oil gallery (18) and the right lifter oil gallery (16), both of which supply oil to the upper portions of their respective sides of engine (10). Oil restrictor system (100) includes a tubular body (110) having an inlet chamber (140). Oil flow is provided from inlet chamber (140) to axial outlet (154) through oil restricting orifice (130). Simultaneously oil flow is provided to the transverse outlet, provided by annular slot (116) through transverse flow restricting orifice (119), formed in annular wall (111) of tubular body )110). Each of the orifices (119 and 130) may have substantially equal cross-sectional flow areas so as to equally restrict oil flow to the left and right upper portions of engine (10).