I should go back and quote you where you claim to know everything about every platform, including the mod motors. But you're not worth it. The DOHC 5.4 was introduced into the Navigator FIRST in 1999. The 4.6 didn't provide enough torque, so Ford stroked it into a 5.4 for their trucks. The SOHC 5.4 was a turd, so for the Navigator they put a better breathing top end on. The Cobra R, in 2000, got a modified Navigator engine. How do I know this? I sat through the NMT (new model training for morons like you) at my Lincoln/Mercury dealer at the time.
so you think because you SAY you sat through dealership training that means anything? morons like you populate the dealerships because you dont have an education.