The 5.4 is a stretch 4.6. I put 2003 GT headers on mine, the saleen pulleys fit perfectly on there, intake plates then the 4.6 intake fits. The PI heads and cams are the same on the 4.6 and 5.4. The serpentine belt fits. The ford racing oil pump fits 4.6 and 5.4's. That's why ford went to the modular motors, they're almost the same, either it's a 4,6,8,10 cylinder motor. The rods and pistons and maybe the crank are different.
That's why the swap is so easy and cheap to do.
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