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Brinell testing overheated head castings?

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I have a couple of RB25DET heads here, one of which I KNOW has been overheated through water pump failure, the other is of unknown origin. I don't suppose anyone has Brinell testing hardness figures for a known good head available, have they? Here in the UK the Cosworth Sierra engine in turbo form regularly used to overheat and figures for a good head versus a "cooked" head are available. I don't want to waste money and time modding a soft casting. Was hoping someone had Brinell figures for the Nissan castings? Thanks.

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