JW51, I don't believe I have run across any info regarding The Rochester model B on this site that has not been helpful. In my much younger years when asked to rebuild or diagnose a carburator by friends or other customers I would reply " I know enough to leave them alone". I had the greatest LUCK making B's to run great. That was years ago and I was working on model B's that had probably never been rebuilt. So there it is...... I was a wizz kid. Not so anymore, these old carbs have been rebuilt way too many times. It takes someone like Hotrod or Jon G, Carbking to figure this stuff out. Many times the surfaces are warped or the power piston shaft is corroded which makes indentations, etc.,etc. Jon G got me going. I'm going to contact him and see if I can get tolerances etc. from his threads. While the B is easy to work on, it can be a horror chamber of missed items. Low vacuum is the major culprit with any of the straight 6 engines that GM made which is my opinion. Doc
