The Street Performance Mechanical lifters are made from a cold formed body with a clipped axle and have 7,000 RPM capability. The lifter wheels in this series are .700” diameter. 


Recommended Spring Pressure: 150-220 lbs Seat Pressure, 300-550 lbs Open Pressure


 

The Standard Mechanical lifters are made from a billet body with a clipped axle and have 7,500 RPM capability. The lifter wheels in this series are .750” diameter. 


Recommended Spring Pressure: 150-275 lbs Seat Pressure, 400-700 lbs Open Pressure


 

The Sportsman Pro is a new design of our very successful 4604 SBC and 4606 BBC lifters.  They are lighter weight and are REM finished. They also feature Full-time EDM oiling to the bearings and allows pushrod oiling on Small Base Circle Camshafts.


Recommended Spring Pressure: 150-275 lbs Seat Pressure, 400-700 lbs Open Pressure


 

The Ultra Pro Mechanical lifters are made from a billet body with a clipped axle and have 8,000 + RPM capability. 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 Pressure: 250-350 lbs Seat Pressure, 600-850 lbs Open Pressure


 The Bushing UFRS Mechanical lifters are made from a billet body with a clipped axle and have 8,000 + RPM capability. 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.

 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.


Recommended Spring Pressure: 250-350 lbs Seat Pressure, 600-850 lbs Open Pressure


 The Black Mamba Lite Mechanical lifters are made from a billet body with a pined axle and have 9,000 + RPM capability. The Black Mamba’s have an axle diameter of .470” with full time pressurized oiling. 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. 

 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.


Recommended Spring Pressure: 150-400 lbs Seat Pressure, 500-1,000 lbs Open Pressure


 The Black Mamba Mechanical lifters are made from a billet body with a pined axle and have 9,000 + RPM capability. The Black Mamba’s have an axle diameter of .470” with full time pressurized oiling. They have Diamond-Like Coating (DLC) for less friction and wear durability. 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. 

 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.


Recommended Spring Pressure: 150-400 lbs Seat Pressure, 500-1,000 lbs Open Pressure