I looked around the web, and found a place that makes shafting for all kinds of stuff, rocker arm shafts included. I would havto search for it but most of you guys would probly find it faster than I. Go to the source, Egge and Kanter dont make them , they buy em. Heck buy 5 shafts and sell em to get yer money back, almost every rocker shaft I,ve seen has wear. My experience with rocker shafts leads me to believe that the oiling is maybe good enuff for a stock engine [when new] but the old oil would not stand all the heat and turn into muck, then clog up inside the shaft, then the rockers would start mating to the shaft. On any straight 8, if you dont really know your rocker arm assembly is OK I recommend checking it out.
OK I just was looking for that shafting outfit and I got a scary lesson of why our country is in trouble. I found plenty of shafting manufacturers but guess who they were, yep just call 'Wun Hung Lo' and you will get more shafting that you bargained for like in 5000 unit lots! Gads it must have been a only couple years ago that I checked and now cant find any US companies. Well Kanter sells I think repaired shafts for $95 with a rebuildable shaft or add $115 core chrg. There may be outfits that repair or hard chrome them ??? anyway keep looking there may be some out fit doing it.