Originally Posted by thepuma

i know those heads will bolt up but you need to change a couple things around as for the navigator motor you would probably need the computer from the donor car as well just cause there are probably a couple of sensors that are on that motor that are needed dont bother with the navigator motor that the 4v heads and put them on the bottom end of your 5.4 cause i would bet that the navigator motor has a lower compression ratio you would make good power and not kill your wallet