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if its a new gen dohc 4v then you can make the power from a lighter engine. don't count on 3900 lbs or anything close to that; it won't need the displacement in the 0-60 or even the quarter; after that the LS3 will pull because of the extra liter but don't think the mustang will fall behind if the DOHC 4V puts out 400 and some change, its just wishful thinking to think otherwise
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