Phil,

I was hoping to be the first RV-10 altermnate engine with a 20B. I have one of the first 100 RV-10 kits. I got underway well but had work problems. The firm I was working for closed to be sold which changed the speed at which I made progress. Sounds like you may be the first 20B  RV-10. It seems a natural for the 20B. What is the setup you plan on using? The nice thing is you should be able to run a pretty quiet exhaust and still make enough power for the RV-10. Good Luck and keep the group posted.

Bill Jepson