INTMD8,
I'm fairly ignorant on the hydr roller stuff. 8000 with steel valves is impressive to me, I'm real curious
about the cam lobes on that one. Also what was the spring open pressure ?

I thought that being a hydraulic lifter automatically limits your open pressure because of the lash take-up design,
that is the limiting factor, not the roller-wheel-versus-flat-tappet factor.

What is the upper limit on open pressure for a hydraulic, 400~~450 lbs ?