I have to agree with Dan-o here...
What is the point of changing motor to suit conditions/driveability, if you then cock things up by changing pinions? I would say that a 6.5L would get hotter indoors though, because it has thinner wire in the can. i.e. more resistance (to give a smoother feel). This is one thing that the Nosrams have over the Novaks, is that they can get smaller rotors to give less torque, but with same size wire.
M.
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