I think you can remove all that corrosion by doing a thorough engine scrub which will decorrosify and degunkify pretty much all the engine internals:

http://kalecoauto.com/index.php?main_page=product_info&cPath=2&products_id=7

Chris S.

----- Original Message ----
From: Zoltan Kuthy <zolo@FOXINTERNET.NET>
To: vanagon@GERRY.VANAGON.COM
Sent: Wednesday, November 28, 2007 3:26:43 PM
Subject: What is the scientific explanation?

I have always wondered, why would there be extensive aluminum corrosion
 built up under rubber hoses on aluminum parts or under the head
 gasket.  I don't see any electrolysis activity going on under such insulating
 material.  I am baffled.
Anyone has an acceptable scientific explanation?  Or is it something
 everyone knows except I.
Zoltan

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