Bobby, I have run 10X6 props on 46 engines for as long as there have been .46 engines. You might step the pitch up a bit, but I wouldn't worry too much about running 11 inch on it. I also wouldn't run 30%. 15% maybe, but anything more than that and you are kind of wasting your time in my opinion. Run it rich if you step up or you will smoke plugs like crazy.