The engine was replaced in my truck before I bought it. The dealer told me this but had no info on the engine. The truck is a 2004 and the engine was replaced at the end of 2007. The engine was a used unit that came from NAPA. I have read that the cam phaser issue was fixed in 2005. I'd like to know if I can tell what year the engine is from the serial number and if so, where is the serial number.
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2007 F150 XLT SCREW 4 X 4, 5.4, 3.73 LIMITED SLIP, TOW PACKAGE. CHROME DOOR HANDLES TRUXEDO TONNEAU COVER, TTT TOW MIRRORS. 
