Chevrolet Racing Performance Lifter, Hydraulic Roller, 0.842 in OD, GM LS-Series, Set of 16. If your Gen III or Gen IV application calls for sustained high-rpm’s, this Racing Hydraulic Roller Lifter Kit is a must. It features reduced mass internal componentry for higher limiting speeds and to accommodate aggressive camshaft designs. Improved valvetrain dynamics and stability deliver more horsepower and better high-rpm performance—tested to 8,000 rpm! Set includes 16 lifters.