SBC/BBC Lifter Oil Galley Restrictors .055” 48000
Racing engines equipped with Roller Rocker Arms should have the flow of oil to the lifters restricted. This forces more oil to the engine bearings where it is needed. In addition, it cuts HP loss caused by oil windage.
These 1/4 NPT screw in restrictors are for Small and Big Block Chevy’s lifter galley passage and have .055″ holes.