My truck is a 2004.5. It had factory 4" exhaust and it has a lift pump mounted in the tank. On the valve cover it says advertised HP 325 HP. So obviously its got to be the 325HP600 motor right?anything else to look for?

 

Sal, If the sticker on the engine says 325hp it is for sure a 2004.5 My 04 was only 305hp and it was an early one. Also the 04.5,s have akitty on the exhaust. [:@]