Thanks for the reply. I noticed the 50/64 EI conversion kit comes with a new prophub, so I was wondering if I could reuse the old prophub on the smaller EI flywheel.

Also, I have a Fuji 86T and would like to know if I can turn the cylinders 180deg, such that the carb in on top of the engine and the muffler still pointing downward. I should just have to turn the pistons 180deg as well, so the ring gap is on the same spot on the cylinders, correct? I would like to use this engine in a 33% Su-31 and would prefer not to have the carb between two hot mufflers.