Another update.
Installed the .52 VMAX engine today, and broke it in tonight. Ran 3 tanks of fuel through it, and it does humm! No problems. Got it adjust out pretty good, still a little rich which is how I'll run it for the next couple of tanks still. I haven't flown the engine yet, that'll come this weekend, but the engine itself sounded good! Can't wait to get a couple of gallons of fuel through it and see what it's really all about. Gonna put a 12 x 5 mas on it and fly to the moon!