Maintains maximum valve lift increases stiffness and column rigidityMaximizes valve-train stability to increase engine rpm, horsepower and torque outputMinimal adjustment parameter eliminates flex and loss of valve-train stability problemsIndividual length intake and exhaust pushrods keep the adjustment extension to a minimumDesigned to exceed performance engine needs using larger lift cams and high spring pressures while maintaining proper and critical oil flow to top-end valve gearMade from CNC-machined 7/16'' tapered 4130 chromoly steel tube 32 thread per-inch adjustmentDouble jam nut lock systemHP+ pushrod wall thickness of 0.095'' Race Series wall thickness of .120''Can be used with hydraulic or solid lifters and street or race engines ''Race'' Series recommended when extreme spring pressures are usedFueling pushrods can be used with factory pushrod tubesMade in the U.S.A.Require removal of rocker covers and rocker arm supports.