AJTIII
Guest
I think your looking at a 3 row corn head and a 13ft. grain head at the maximum for this machine.A 550 is a lot more of a machine without getting too much bigger in overall size. You could put a 15ft. grain head on it as well as a 4 row corn head. The 550 took over for the 510 and I've seen some with 6 row corn heads on them though I don't recomend it. Good luck in your search.