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					Originally Posted by FauxDiablo  Porous aluminum block and head castings are INCREDIBLY rare in pretty much every vehicle made since forever. And by incredibly rare, I mean so rare that a tech will not spot it unless they are looking for it after taking everything apart and using ultrasound and/or magnetic or flourescent testing.
 If you had a porous casting, this problem would have been spotted a very long time ago. My guess is anything but a porous casting.
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I agree, I’d be getting a 2nd opinion on your problem!