chaos.lrk.ar.us!dave.williams (Dave Williams)
hotrod  8 Feb 93
- -> built up - but how do they exactly work ? How do those socalled
  -> "Variable-Duration"  lifters  work  & what's different in their
- Basically, they're pre-worn-out lifters with a very high bleed rate.
  At low RPM so much oil escapes they can't open the valves all the way.
  As revs come up, they are able to open the valve properly before the oil
  bleeds off.
- No magic there, except I've always wondered how long they'd last.