There was someone here promoted a lifter that was slow to pump, and for some reason to add or delete duration, I never did understand .
"Rhoads" lifters or similar, is it possible these could be those ?
Could just be lifters .
jmo
I've run Rhoads. They can be a little noisier, not ust at start up. A couple other companies made similar lifters. One, I forget which one, claimed to be quieter.
The idea is they bleed down quicker to reduce duration and therefore overlap. As rpm increases the less they bleed down. Neat trick and it does work to some extent.