On my Kadet Senior kit, I lowered the engine 1/2" below and an extra 1/2 degree down thrust as I went with a .61 instead of the smaller .40 it asked for. I haven't noticed any ill affects from doing it, but with the airframe of the kadet I think you could probably do anything to it. This is my first year in the hobby, so don't take this as a definitve answer. I would seek out further assistance from more experienced ppl and different type of airframes. Just thought I'd share what I did to this plane.

flynte