Designed for engines with radical valve spring pressures and large lift camshafts; maintain proper and critical oil flow to top end with metered oiling Optimize valvetrain stability, increase engine rpm, horsepower and torque output Decrease valve float; maintain maximum valve lift Made from hardened steel, CNC-machined and precision-ground Recommended for both strip and high-performance street engines Made in the U.S.A. High volume oil pump recommended.. LIFTERS RS SOLID 99-17TC