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PHOENIX, I have to wonder what is meant by "a porous cylinder block"... All metal casts (even after machining) are porous on their surfaces, but does the person mean the casting allows liquids to pass all the way through?? Frankly, I doubt this very much and suspect, without even getting all the facts here, that the casting was cracked. Aluminum is a funny metal, it is wonderful in many ways but not as predictable as iron.
To answer your question directly, if you have had no trouble with your 98 DI block so far, she's probably not 'porous'. One suggestion though - change the coolant every year and don't let her overheat.
 
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