78 390 con rod problems ?

Just fitted a new rod to my 78 390WR. The parts were ordered as the original numbers from my parts book. They were from Jef Bens in Belgium.

With the new rod in place it just fouls the crankcases at the front and rear. It seems the culprit is the junction between the big end O.D. and the start of the rod itself. The machined diameter of the big end does not seem to blend in correctly with the rod. It is not much (maybe .5mm in a small area). Has anyone else come accross this problem ? My thoughts for tomorrow are to gently blend the offending areas of the rod with my dremel.

Well sort of, I bought some new old stock crankshafts perhaps six or so years ago and have from time to time wondered if I got seconds (rejects due to quality issues). In my case it looks like the machining on the big end of the rod went farther around and into the popsickle stick part more than the origionals but I have yet to mount any of them in bearings and cases. The machining itself is kind of crude as well like whatever tool like an end mill they might have used should have been changed a while back. I would modify the cases the way I envision what you are describing.

Fran