Lowley:

I'll agree on the R-985 being a really good engine. There has been enough experience in the 60 odd years it's been around, the old 800 hour TBO is a thing of the past. Not so with the R-1340.

But the best? That is without question the R-2800. Even the FAA has approved a 3000 hour TBO on them. Granted, it's just a little tiny bit too much engine for a Stearman conversion, or to hang on your Agcat. Still a much better engine anyway.

The R-2800 was, incidentally, built in greater numbers than any other radial engine. The R-985 was the second highest production.

Bill.