MiTasol
1st Lieutenant
Allison V-1710 C series (long nose) engine manuals
Long nose Allison manuals seem fairly rare. I have one copy I cannot find at present but here is one I got from who knows where a couple of years back. It is in Russian but the photos and diagrams are good. The same manual covers the E-4 for the Airacobra. I will post the other when I find it...
ww2aircraft.net