I have seen a few messages both here and on Facebook for people requesting maintenance manuals and/or IPC's and not having any luck.
I bought a full set of manuals from Essco Aircraft.
-C337 Owners Manual
-C337 Service Manual
-C337 Parts Catalog
-IO-360 Operators and Maintenance Manuals
-IO-360 IPC
-McCauley 300 Series Overhaul and Parts manual
Essco Aircraft
579 W. Tuscarawas
Barberton Ohio 44203
877*318*1555
http://www.esscoaircraft.com/
sales@esscoaircraft.com
The website is pretty easy to navigate, they have a great selection, and the price is pretty reasonable. Somewhere around 30 to 40 bucks a piece.
Leighton.