Definietly not a used block. As I had them open before I put the system together to clean any aluminum shavings out of the block that may have been caused by switching the fittings. They were nice and clean. I believe this occured so rapidly now because of the large area of copper in my system, (Two copper radiators and the bottom of two blocks) and the fact that copper and aluminum were is direct electrical contact with eachother. (the screws holding the plate on). This completed a near 0 ohm galvanic circuit. I think I'm going to try coating the aluminum in something. I think "painting" a good layer of epoxy resin might do the trick.
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