Larry,
I'll definitely keep that in mind for future projects. Right now my engines seem to give me all the performance I need and are very reliable. I'm setting one up for a 1.20 size Gee Bee R2 ARF I just bought and this will be the first 2 ring engine I've done. I can tell that you guys are 100% correct about the 2 ring advantage just by turning the engine over by hand before I started to work on it. All my engine cores except for one were single ring so that's what I've been using. Those engines all ran fine with sufficient power for my needs so far. The Gee Bee is gonna need a little more I think. With all the mods I normally do and the dual rings it should be just about perfect. If I ever get into a project where I really want to push the envelope hard I'll hit you up for an ultra high performance reed valve plate. Don't need it quite yet though...

Thanks,
Pete