Maybe you guys can answer this, if you run a hollow pushrod on a Mopar solid roller lifter cam (conventional shaft oiling through the cam bearings) ...does any oil still "pump" up the pushrods to the rockers from the up and down motion of the lifters? i know oil feeds in the rocker studs feed it the other way (gravity), I just wondered if any pushes up. small blocks (especially aluminum heads) don't seem to have much in the way of drainback (that doesn't pool up and drain down the pushrod passages) and as we know it tends to all go to the back of the heads when racing)

I've been running a knurled bushing around the #2 and #4 rocker shaft hold down bolts (where the oil passages enter the rocker shaft to limit top end oil to "less but adequate" rocker oiling, and since I'm running Cup type rocker studs I can use standard thick wall comp pushrods that are rounded on both ends (like any SBF or SBC). The bushing probably has about .003 clearance all around.

I don't know if I've stumbled onto a cool solution to limit oil to the springs or not (my logic concluding I'm leaving more oil in the system to feed the mains and rods) but it has been working quite well.