The eaby pickup tube measured. View attachment 1715273231Looks too thin to drill to 1/2". So if you do the standard oiling mods and drill passages to 1/2" the bottleneck will still be where this tube screws into the pump. About 22% less flow.
I don,t think you are comparing apples to apples.
The suction side works differently than the output side.
I thought that drilling the passages in the block to half inch was to decrease the pumping losses. It's easier for the pump to push the oil.
It does not mean the leakage rate of the motor will be higher just because we opened the passages up in the block. The bearing clearances would still be the restriction.
The flow rate through the block could still be substantially less than what the passages could free flow.
