Hey guys, picked up an all original D50, it runs but has a "tick" in the top end. Pulled the head and had the valves and guides redone and the machine shop said the head/cam/valves were all in great shape. He said to check the balance or silent shaft as the bearing sometimes goes out and they can move around in the housing. Anybody have any experience with that? My next option is to drop the pan and check the rod bearings. Any help would be appreciated.