Dave, that is exactly the same engine I have on a pylon racer. It's a real powerhouse. I have a Mac's muffled pipe on it and a Picco 12mm carb. It's set up to run 20% nitro and swings an APC 11X11 at 13,500 on the ground. I did raise the exhaust port .040. I was amazed the the inctrase in timing and the big carb really did not take much away from the idle and transition.