MOREL LIFTER SET - LS - HYDRAULIC - LINK BAR - 5290 The Street Performance Hydraulic Lifters are made from a cold formed body with a clipped axle and have 6500 RPM capability. These lifters have .120 plunger travel and have an 80% fill rate with the test oil. The lifter wheels in this series are .700 diameter. Recommended Spring Pressures are 100-180 lbs Seat Pressure and 280-380 lbs Open Pressure.