Ya, found this place months ago. Kinda lurk around occasionally.

Ives.........the flywheel is NEUTRAL balanced so it does not matter what it's bolted to. As long as the motor is INTERNALLY balanced...the flywheel is neutral....it makes no matter.

I have my 428's internally balanced so that I can run a neutral wheel and not have to worry down the road if I need to change flywheels.