After reinspecting the corroded waterbox heads at my local VW, I feel that
a feasible repair option is Fel-PRo's "head Saver" system. I'll research to
see if Fel-Pro has a application to the waterbox engine, or is interested.

The head saver system is essentially for corroded aluminum heads.  It
involves having a local machine shop grind the corroded surface of the
head, and then the head saver is a aluminum spacer that makes up for the
loss in grinding.

If this type of repair is done, the factory seals are still used.

The cost of the repair would be significantly less and just as durable at
"new heads."  In fact the spacer, would become the sacrifical part of the
repair. Ie if you have to later redo a head, the corroded spacer is
replaced with a new spacer and your back on you way!

Respectfully,

Mark Keller
91" Carat WE
"Lazarus"