"rip" wrote in message . com...
Dan, don't waste your time.

I agree. Also, I think he's wrong about engine compatibilities. There is NO
TC'd change for the O-470 of any variety although some of the L-17's did come
with them.

The eligible 470-series upgrades are the IO-470-C as Rip identified. It's
got the one small advantage in that it does not require your pre-B model to
have the fuselage beefed up. The down side is that I believe the Macauley
called out for that engine is a bit scarce these days. After that, you're looking
at the -H (260 HP) or the 520. All of the Navion s/n's are legit for these
upgrades as Rip says, without even a 337.

Going to the flanged crank means you can ditch the Hartzell bailout prop.
Of course, if you want a new (no AD's required) one for a GO-435, let me know. I've got a zero time
one sitting in my garage.