There will be small holes in the shaft that line up with each rocker arm. Those holes should be pointed down, not up. Those rocker arms you are using should have what are called banana grooves cut across those small holes to help distribute the oil. Also, the 5/16 holes that the hold down bolts go thru, the 2nd one from one end will be bigger on the bottom of the shaft than it will on top where the bolt goes in. That hole being larger allows the oil to flow up from the rocker shaft pedestal it flows thru and flow thru the shaft and oil the rockers thru the small holes and grooves.