We had the stock front pully keep shaking itself loose no matter what we did after we put the heavier flywheel on it,
This caused the keyway to be damaged which was fixed with a Porshe keyway but we decided to play extra safe and have to sides machined in to the crank.
We also had the rotating assembly dynamiclly balanced by vibration free also to remove any renasonce that could have caused it also.

Mark