Produktbeschreibung
HIGH PERFORMANCE HYDRAULIC LIFTER, extra quiet when compared to solid Lifters
The 5003S is the _tightest_ clearance hydraulic lifter possible. It is as close as you can get to a mechanical lifter performance and still have the low maintenance of a hydraulic lifter cam. This is the reason they produce the most power. A Tru-Arc retaining ring is used in this Johnson Hy-Lift lifter made in the USA.
Do not use oil heavier than 10W30 oil.
Note: “S” or Slow Design: These parts have an “S” designation after their part number. So a Slow
Design part number will look like A-0817S. These Lifters have a Leak Down on the upper
end of the scale from 90 to 120 seconds. In a performance application these lifter will actually
act like a mechanical lifter with very little effective loss of valve lift or duration at any RPM.
Just like the “R” Lifters these have a much smaller Leak Down range that will also balance all
of the cylinders to each other. These lifters are very hard to produce because the TOTAL
clearance between the I.D. of the Body and the 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 standard and “R” lifters. The only draw
back of this type of lifter is that if the valve train should “Float” because of reaching a higher
RPM than the valve springs can handle these lifters will try to take up the excessive clearance
causing the valve to hang open resulting in a loss of power. Because these are Hydraulic
lifters there is no lash or additional adjustment needed and the full cam profile is translated
to the valves. In testing, not only did these lifters result in more power and higher RPM
reading over other Hydraulic lifters they also reduced valve train wear and failure compare
