Farmer_Ed
Guest
I would definately go with the F!  The sizes in order I believe are E, F, M, l.  They also had updates and such which they would place a 2 behind them, like F2, or the last ones were with a 3, such as F3.  The E would probably be enough machine, but the F is very inexpensive to buy and the parts availability is substantial. There are a lot of headers for these machines as well.  Allis Chalmers sold a lot of them.  I have heard that the diesel engines are good, all of ours have the straight 6 292GM engine.  I'm not much of a GM_Chevy man but this engine is the best engine they made in my book!!!  lots of power, smooth running and easy and cheap to get parts for. We run a couple of them and an F2 and they work excellent in all of our specialty crops so I know they do good in small grain.  That's my opinion so take if from there!  Be happy to talk with you more on this matter if need be.