This is wicked! I get to talk to fellow rc'ers all day long and learn stuff. I had never heard of some of the things that are talked about here. Now that you mention it, The engine seemed to be running a bit high. It might demonstrate a bit more power with a better prop selection. That is never a bad thing. What experience is out there with the older st 60 engines? Mine has "60" stamped on the port side, with a large "V" cast under it. Just the typical "made in Italy" stuff on the starboard side.