No oil to rockers but have oil to lifters what rmp to flow shafts with all new stuff

Sometimes the Eddy heads have an issue with the oil passage feeding to the rocker shaft not quite being drilled all the way through & leaves a burr that blocks the passage by about 50%.
I've also seen rockershafts that have little flaps of metal where the rockerarm oil hole is drilled through with a dull bit. You'll need to extract the end plugs to verify.
I also like to grind a little slot in the shaft where the oil comes up through the saddle bolt hole to give a better flow path for the oil.