Mark,
One other point.  Whan I talk about adding the counterweights, it is to an engine that is putting out up to a 50% increase in power over stock and making it live.  The CW will allow the same or increased life on the bearings with the increased power.
I also lightened the flywheel by 3 lbs.  You can not do this on a engine without CWs due to the increase in harmonic vibrations.  These are bad for bearings.

Robert