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Only oprions left is, as stated, cracked/ leaking cylinder walls. Or it might be a warped deck- surface. Anyway it has to be water. Since heads & inlet are ruled out....
You might try to pressurize the colling system with compressed air and with the plugs removed, you might find what cylinder is involved and if you're lucky (specially if you have a micro- camera) find where the leak is?
RuneS
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