Hi Dave, Today was test day. The 2bbl engine with the adapter to fit the Walbro WT324 carb on the cut down and modified Toro intake was run today. The Reed intake tubes are now getting an air and fuel mixture. It runs pretty decent and is flyable. The RPMs were 8200. Maybe a larger carburetor still would raise the RPMs a bit more. 8200 is about 500 more than I got before. Scott is getting these RPMs without all the extra work. I think I will leave this engine as it is and convert one of the other 2 bbl engines I have, the way Scott does them, and use a bigger carb than the Zama carbs I tried before. One drawback to making an adapter plate to fit on a modified Toro intake is that you still have the carb sticking way out to the side. I am going to try a closer-in mounting for the carb. The muffler I came up with sounds much better than the original, but I don't see much of an RPM difference. My muffler mounts a lot closer to the engine so I am going to see if I can find some more of the 1"x2" "Aluminum Railing" stock to make more with the stacks on the end this time. With a close mounted carb and muffler, the total width is easier to fit to an airplane and will look a lot better. I fussed with a single barrel engine also, the results were weird, so I think I might have messed up the carb spacer that I made, it was a preliminary design and I tried something different. I junked it and will try a new one. You CAN spend time on these. I don't have the Laser Tach under control yet, I only attached one reflective spot but it must be counting both blades anyhow because I was getting 16K readings. The Laser also does the autoranging bit like VOMs do and that is distracting when you are operating the throttle and watching to keep your hand out of the prop.