Another thing about ABC engines is that you shouldn't run them
too rich, as that would make them run cooler, and ABC engines
depend on operating temps to create a good seal between the
piston and the cylinder wall. Lots of people get used to breaking
in engines one way. They set them up ultra-rich, gurgling, almost
4-cycle type of running-in. That would be fine for the ringed ones,
but run the ABC engine a little leaner, to get the temperature up.

By the way, do you fly at the Bandera field there in San Antone?
I'm from S.A. originally, and have flown there. Very short final
approach from the west...

Jesse