Oil only on one side of engine... help?

small blocks are oil by the no.2 and no.4 cam bearing....the hole in cam must line up with hole in cam bearing for the oil to flow to the head.

the rockers shafts have a notch on one end...that notch goes down and toward YOUR left...

driver side notch goes to front of car....
passenger side notch goes toward fire wall..

the oil holes in the shaft will point down and towards the exhaust.