Maybe he's trolling us????
Not trying to troll, so the part numbers are HY2269S for the HyLift Johnson, and ST2311SBR for the Johnson lifters. The HyLifts are a drop in Magnum replacement style, and the Johnson's are a retro fit link bar.
Description from HyLift catalog.
“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 compared
to mechanical lifters.
