believe it or not, I use the 1400KV T600 outrunner (2 of them) in my Twin mono. (boat)
very torquey motors and run great.
I change the bearings every winter and they just keep going. Very well made motor in my opinion.
I Run mine on 6S power, but the 880KV version I believe can run to 8S and the 1100KV one can run to 7S. The 1400KV one is rated to 8S.
I know this does not answer your question for Heli use, but I really love the motors.
there are also pics of t-rex's in the files tabs that show what needs to be done to make them fit properly.