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Message: [QUOTE="bismic, post: 1551779, member: 1537"] I only asked about water flushing to see if he was less than 50% coolant concentration. Even though it has nothing to do with HIS heads leaking, it is something to take note of. You can not get to a 50% coolant concentration after a water flush with 50% coolant. I agree that you can run lower coolant concentrations, but the degas pressure does go up somewhat as the coolant is diluted (water will boil in the EGR cooler). Corrosion goes up also. Anyway, enough of off-topic discussion. As I posted earlier (post #7), I still think it is due to aggressive block prep ... even though the OP does not think so. Only more troubleshooting will reveal the facts. [/QUOTE]

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