If you ran it that long overheating, chances are it will be cheaper to replace the engine. The knocking is most likely from rod and main bearings. The fact that you need to keep rev the engine to keep it running tells me other internal damage has happened (head gasket, intake gasket.) Because I am not there to actually hear it, I would recommend having a mechanic you trust listen to it. But if I am correct, try to find a good low mileage engine in a salvage yard and replace it.
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Wednesday, January 12th, 2011 AT 9:44 PM