These lifters have a Leak Down on the upper end of the scale from 90 to 120 seconds. In a performance application, these lifters will actually act like a mechanical lifter with very little effective loss of valve lift or duration at any RPM. They also have a positive retainer instead of the OEM wire clip design. These lifters are very hard to produce because the TOTAL clearance between the I.D. of the Body and Piston assembly is reduced to less than 0.000120" or 1/30 of a human hair. These are like super heavy-duty shocks and can handle higher spring pressures without collapsing like the OEM and Race lifters.

• These performance tappets offer premium performance, strength and reliability at a reasonable price
• Made of high strength steel alloy and heat treated for strength and wear resistance
• The internal parts are machined to tolerances for long lasting use
• Sold Each

STD O.D.
Pro Street Design Hydraulic Tappet
Fits Twin Cam 1999/Later & Sportster 2000/Later