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good thing the porosity only showed up around the coolant passages and not in the combustion chamber. maybe you should check your coolant



If memory serves, chrisf said 440source gave him some line about coolant ph levels, like anyone ever checks that. Unless you're running pure acid as a coolant this should not be happening.




Coolant ph is EXACTLY what causes that kind of damage. I see it all the time in big diesels and the ph levels that can do that to cast iron are a long way short of pure acid so it's no surprise that even moderately elevated levels will erode aluminum like that. The fact that nobody ever checks it still doesn't make it 440Source's fault.

Kevin