So I have my 5.4 motor complete out of a F Series truck,for my 2003 GT. I also have a complete 4v out of a 9? Mark 8 what are the diffrences in the Mark 8 motor and the 99/01 Cobra heads? On the same note will these heads go on the 5.4 block? If I read correctly the gt40 uses a 5.4 block and pretty close to stock 03/04 cobra heads. What is keeping me from trying this setup. A 5.4 is gonna be wicked a 4v 5.4 will be
insane 