JB wrote:

Well there's my answer... no -R on the serial, it's a factory o/h
then. I'm still thinking about what to do with the jugs; I know the
prices of new ones have come down quite a bit, with jugs from ECI and
Superior going for around $900-1100 or so, but still... if these are
first run cylinders with 1660 hrs, and the engine was running great
when removed; there's probably lotsa life left in 'em after an
overhaul, and I'd get to save several hundred bucks per jug.

According to their ads, Lycoming replaces the cylinders with new when they
overhaul an engine.

George Patterson