* unless you've been using the same oil gusher roller lifters in each build that you're speaking of?
and even if that is the case, 1/4" is justa little too close IMO. once the pump starts getting some good suction going the oil can become a 'coupler' that will draw the bottom of the pan closer yet to the pick-up
what you're seeing at 5k is an 'out of oil' scenario for whatever reason
there'll be phantoms, there'll be fires on the road... and the white man dancing