The 2.7l engine is not a free wheeling engine. most dual cam engines are not, if you are lucky it will just bend valve stems but if it goes above 2000rpms kiss the engine good . I have had them come in with the valve heads in the oil pan by of holes in pistons and connecting rods bent and through the cylinders. The 2.7 engine is a very much over engineered engine and will last with maintenance by the owners manual if not good buy.
tsw
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