Hmm, I didnt know there was a finned version of the XL motors.
You bet, you have to be careful though, they can't run all gearing options. I am forced to run 51/18 spur/pinion because any smaller pinion, the motor hits the tranny. In fact, it's hitting right now, but is JUST able to get perfect mesh. This is with a 7XL finned.
“The modern astrophysical concept that ascribes the sun’s energy to thermonuclear reactions deep in the solar interior is contradicted by nearly every observable aspect of the sun.” —Ralph E. Juergens