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The easiest way to tell the difference between a 2004.5 and a 2004, is to look on the drivers side of the valve cover, look where it says "Advertised HP" and if it says 325HP its a 2004.5 and if it says 305 then its an early 2004.How would I be able to tell if this truck I might buy is a 2004 or 2004.5?