electrolysis!

[So Cal Mark]

this is the result of sitting for 12 years with plain water in the system!

[BEEK]

wow, wonder if it overheats?

[TX82FIAT]

I think it is more Oxidation unless current was running through the part. yikes..

[bobplyler]

I think it is more Oxidation unless current was running through the part. yikes..

When you have dissimilar metals, and an electolyte, you do have electrolysis, with a current flowing.
http://en.wikipedia.org/wiki/Galvanic_corrosion

[TX82FIAT]

Good link. makes sense, electrolysis it is. Thanks.

[vandor]

Yuk!

I've seen a whole cylinder filled with that stuff on an engine that sat for a long time.

[76was124]

Wow, picturing what condition the block would be in, is that even salvageable?.....or should we say more like scrap metal salvage!

[djape1977]

i've had such engines in past and aluminium parts just crumbled in my hands. not sure if it was just water or old type green antyfreeze that caused that though...