SBC and BBC oil restrictor kits screw into existing lifter gallery cleaning plug holes at the back of the block. It reduces oil flow to upper engine assembly, leaving more oil available for the rod and main bearings. It also reduces power-robbing windage by reducing the volume of oil passing by the rotating assembly on its return to the pan. .0625″ hole diameter. Two pack. NOTE: Do not use with hydraulic lifters.

SKU: 085 22010