I finally took the new flywheel and silicone dampers out for a flight today.
I was hoping for a slight improvement in idle and/or smoothness with the
little bit of extra weight in the flywheel, but I guess 4 lbs is just not
enough to make much of a difference.  I flew around for about an hour and
got the RPM up to 7000 and MAP up to 40 in., and loading the plane to 4G
(thinking about gyroscopic forces) without any noticeable change in the way
the engine sounded or ran.  Everything look ship-shape on a post-flight
examination.

This is the ACT flywheel that Kelly found for us.  Looks bulletproof
compared to a flex plate.

Next project, finish installing the ADI system.