The shafts are supposed to be round. Those flat spots are wear, caused by the lack of lubrication from the broken oil connector. Check the rocker arms- - - -they will probably also be worn egg-shaped. Rockers can be reconditioned by boring the holes out and installing bushings- - - -the shafts are junk and need to be replaced. If you're just trying to get the engine running, don't worry about the worn parts- - - -the engine will still run as long as you take up the slack with the valve adjusters. I'd recommend turning the shafts upside down temporarily to put the worn spots on top to minimize the amount of wear you have to compensate for. It's not a permanent fix, just a work-around to get the engine running and check out the rest of its condition.
Jerry
