If there's one piston top that's noticeably cleaner than the others (because of the coolant) then this just indicates that you have had a bad head gasket. Doesn't prove anyting else though. A compression test would have to be done to really know but most likely it hasn't damaged anything unless the vehicle has been driven past the overheating point.
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Thursday, April 30th, 2009 AT 11:30 PM