This Oil Restrictor Kit for newer GM-Style blocks (like Gen V/VI) has a .0625 orifice diameter (oil lifter galley bosses flush with bell housing face). It reduces windage & oil flow to upper engine, leaving more oil for rod/main bearing.
; Reduces oil flow to upper engine assembly, leaving more oil available for the rod and main bearings; Reduces power-robbing windage by reducing the volume of oil passing by the rotating assembly on its return to the pan; Do not use with hydraulic lifters
- Newer GM-Style blocks (Gen V/VI)
- .0625 orifice diameter (oil lifter galley bosses flush with bell housing face)
- Reduces oil flow to upper engine, leaving more oil for rod/main bearings
- Reduces windage
- Don't use with hydraulic lifters.
