Hi diablo_r and Dave wallace,
I hear what you two are saying and I got tired of wondering and guessing what would happen if we did what I am trying to do now. Rich reminded me that I didn't notice a fuel nozzle in the second barrel of the carb, and you Dave are asking the question directly. When I first tried my slotted intake manifold approach (modified the Toro intake manifold), it seemed as though it was going to work, so I cleaned up the intake a bit more and opened the directional ports in the cylinder etc. This caused the engine to run great until the second barrel began to open, then it would bog down. Looking back, of course it bogged, it was too lean. If I blocked the second barrel with a finger it ran ok. At that point, I thought I am spending too much time on the problem and just wanted to move on, so I went to work on the 1 bbl engine again. Rich stated in his initial post that there was no fuel added to the second barrel, just air. That stirred my curosity again, of course, Rich is right, no fuel - it was too lean. I knew that sometimes with carbs a too lean and or a too rich condition can be confusing so I was just going to drop the idea and then along came Rich. O.K., I already had it figured, how to do it with a Walbro carb, so I would do it and find out if there is anything to be gained. I still have not had the chance to run it. The photos in the previous post show a WT 324 carb and I have a few larger ones. A family wedding and a few other things came up. I don't think I would bet on how it will turn out, as far as more performance is concerned. I will probably run it tomorrow. I will post the results.