Only size listed on the web page. I agree with you though it would be a great engine for something like the Sukoi or a Stearman. Seems to produce a ton of power too. It didn't have any compression when it came out of the box but after 4 tanks of fuel it is getting much better. The big problem is the price. It lists for around $350. I got mine from the local hobby shop for around $260. but I think he gave me a pretty good deal 'cause they had had it for a while. The way these engine manufacturers price their stuff, a .60 would probably run around 500-600 bucks.