Designed for engines with radical valve spring pressures and large lift camshaftOptimize valvetrain stability at high rpm, decrease valve float, maintain maximum valve lift, increase horsepower and torque outputCNC machined and precison ground with 0.700'' diameter rollers maintaining proper and critical oil flow to top end with metered oilingUtilizes standard pushrod seat heightMade in the USAFeuling recommends the use of Race Series® adjustable pushrods or comparable heavy duty adjustable pushrods.For best results Feuling recommends the use of a high volume oil pump.