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Non magnetic and brittle..sounds like plastic or a fuel line
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The picture doesn't really show it, but it is definitely some type of metal. The places where it has been worn down show definite metallic shine, and the wear seems consistent with metal decay. Just my opinion, but here's another picture that hopefully will show what I think I see.
The thermostat will definitely be replaced, and I am glad to hear that I might not have to split the case...I have heard that with these mag cases, once they're split they usually require line boring and other machining to get back to true.
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Did part of that break off? Can you inspect that bore?
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I unfortunately don't have the block here at my casa, but I will make sure to inspect that bore when I get into the shop tomorrow...I hope that it is all intact, but based on the rough dimensions of the metal scrap (it seems to have the same basic curvature of that bore) I think your theory might be right. I will dig deeper tomorrow and hopefully get some more information.
Thanks for the input guys, I am always trying to learn more as I work through my first top-end rebuild.