RE: Engine life
I have an ST G60 Bluehead that I finally managed to pry out of a friend's hands. I was there when he bought the engine new and I witnessed him flying it on his pattern ships for a decade or more. Believe me, this guy flew a lot. The engine shows signs of external wear, but the interior/fit of the engine is excellent. This one still turns heads when fired up with either a Mac's open front muffler or a tuned pipe. It spent most of its life swinging an 11x6 prop with a tuned pipe. Today, I can mount it up, fuel it and off she goes in a couple of flips, or less. Like I say, it is rough looking (needs an antifreeze bath), but it is still a solid contender for pulling a classic pattern model. Jim must have replaced the bearings at several points in time, but I don't think he ever replaced the ring in this ABC/ring engine.
Ed Cregger