"Corky Scott" wrote in message
He's reluctant because he said they typically require a top end
overhaul at around 400 hours, that they never make TBO.

I've heard the same thing about the big Lycomings too. My anecdotal evidence
includes 19 TSIO-520 Continentals that went to TBO. The only problem was a
bad batch of aftermarket chrome cylinder plating on 4 cylinders of one of
the overhauls.

The secret is knowing how to run these engines.

D.