A friend is reviving an old 350 Four and asked me how to adjust it's camchain. Over the phone I told him how I use to do it. But that's for a 500 and I remember some do it their way. Is it the same as for a 400. Can you do it whilst engine is running? At what rpm? Or is it better done static. Any specialities to observe? I did a search, but didn't find much on this subject.