Moroso 22000 - Oil Restrictors, SBC & BBC

Oil Restrictor Kit Do Not Use w/Hydraulic Lifters Screws Into Existing Lifter Gallery Cleaning Plug Holes At Back Of Block .60 in. Orifice Dia. 2 Per Pack • 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