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I need lots of opinions on this. I have an 07 Mustang with a 4.0 liter with 147000 miles. The head cracked and spewed coolant all inside the cylinders. I was told it burned so hot it left a white powdery residue. The mechanic suggested getting a used engine and replacing it at a cost of about 4k. My question is, do I take the advice replace the engine which I cannot afford or do I buy two brand new heads and replace those and hope for the best?