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Not good, that is one of the worst things you could ever do to a motor, why people do it is beyond me. You will need to do a flush about every 100 miles for the next 1500 miles till that crap is out fully. May even end up rodding the Rad again after that. Depending on how long the motor sat with that stuff in there it will end up clogging up really bad. When it sits for a length of time it turns to concrete, seriously. Toast knows this first hand after spending several slaving hours pressure washing out all the coolant passages of the diesel block. This was also after we both spent an entire day doing it once before.