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