Originally Posted by Westlotorn
Rings are good look elsewhere for the leak.
There are two things that come to mind that may or may not be related to the "must be a vacuum leak" diagnosis and was not a problem until recently:
1. the plugs are oil fouling like never before. There even is oil on the threads. I rarely see any oil smoke from exhaust.
2. The exhaust at idle is so rich it will burn your eyes big time. I first thought this a carb problem but after swapping out 3 other carbs (1 new and 2 new rebuilds) I have to deduct there is something else here.