The Bushing UFRS Mechanical Lifters are made from a billet body with a clipped axle and have 8,000+ RPM capability. These lifters have a special break-in lube between the axle and roller wheel and should not be washed with solvent prior to installation. These lifters also require a break-in period of 25-30 minutes varying the RPM from 1,800-2,200 RPM. The .842" & .875" diameter lifters in this series have a .750" diameter roller wheel. The .903" diameter lifters have a .810" diameter roller wheel and the .936" diameter lifters have a .850" diameter wheel.
Recommended Spring Pressures are 250-350 lbs Seat Pressure and 600-850 lbs Open Pressure.
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