I have to say something on this: I am a ST guy, have always loved them and always will but with deference to the other great engines out there. I do have a beef and it is this; I like the round head ST's but the aesthetics of the square head (later)runs just makes the engine look like a truck engine and I think it takes away from the sleek lines of the plane. A Rossi, OPS, Magnum, you name it, these are all great runners since he is going to run an 11/7.5 or thereabouts prop which all of the stuff you guys have mentioned will turn over very well. So will the ST. It's just that it looks like a slug on the front of the ship sticking out there and all. Sure it runs well but it just takes away from the classic look of, in this, case the Dirty Birdy. I know, I'm probably a little over the top on this it just bugs me that's all so ther you have it. Thanx for letting me gripe.