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.
You could easily cut the threaded end off that pickup, and weld on a larger diameter piece threaded at 1/2 inch pipe.
Would still be a nice looking pickup tube with a larger inlet diameter.