Enjoy reading about your enhancement regime to achieve a higher performance
"Wasserboxer".  Sounds great to me and makes sense.  Thanks for your advise
concerning the gunk that can build-up in the breather tower, too.
Incidentally,  it seems to me that you are right on the money regarding the
notion that one of the big problems with engine rebuilds is that some folks
may devote less time to cleaning the old stuff than they might benefit from
doing.  Small story may interest you:  after tearing down my waterboxer for
a recent rebuild I had some extra time available.  Cleaned the external
surface of my case with a diamond, scrapping off all the "snots and
snagglepusses" (original casting imperfections) so that air flow might be
enhanced.  Fewer bubbles and fins to snag external debris.  Seems to have
helped as my new rebuild has never run cooler. Regards, Diamond Dave
Gunning, G.G., Lovell, ME 04051