Pawnee 150HP engine upgrade

On Sep 21, 9:06*am, Andy wrote:
On Sep 19, 5:26*pm, 150flivver wrote:

I've reviewed the logbooks of the Pawnee-150 in question. *Apparently
back in 1966 the owner at the time hung a 230hp O-470 engine on it in
place of the O-320. *The 337 filed with the FAA just says they
replaced the engine, modified the cowling, moved the battery, weighed
and flight tested it at a new and higher gross weight, all in
accordance with CAR 8. *

Have you considered returning the airplane to the 1966 configuration
which appears to be the last time it was legal? *Why would a field
approval or 337 be required to restore the airctraft to it's last
properly documented and FAA approved configuration?

Andy

I mentioned to the owner that if the last 337 hadn't been filed
documenting the current condition of the aircraft (ie. legitimizing
the O-320 replacing the O-470), then it would be possible to find an
O-470 and the necessary parts to install it and have it comply with
the 1966 conversion paperwork. He's going to order the CD from the
FAA and see exactly what the FAA has in its records as to the current
status of the aircraft.