Rocker shaft oiling

This may be a stupid question, but I can't figure out how the rocker shaft gets its oil. Obviously it does, since I just disassembled the shaft w/rockers (btw, found about half of the oil feeds for the oiling to the rockers plugged...) and it obviously is intended to pressure lube the rockers, etc. But I can't figure out how the oil gets there. The bolts are not hollow, neither are the pushrods, so how the !@#$!@ does the oil get there? And, yes, I did install the shaft with the notch up and forward per my manual!

thanks for any info.