I just joined up, and a fellow f250 5.4 driver. Figured this would be a great thread to put my two cents in...
I'm driving a 2004 with a 2003 model (heads have newer plug depth design) engine. So I'm running a 16 valve in this big boy. It really doesn't matter what I have done to it or will do to it, as far as horse power goes this is the wrong engine to have in a 3/4 ton. However I can live with everything else, as to me everything else is a pro. The lack of HP is my only con with this engine. Torque is great. You have to remember that engines have come a long way from the 70's and 80's. Yes the 5.4 displacement is on the small side for a 250 but it would also out perform a stock 351 from the 70's and 80's. Possibly even as much factory torque as a factory FE block from the 60's and 70's.
I took my rig up in the mountains for a real test. I wasn't nice to it and was kind of scared to tell the truth. "Will this truck I got be gutless up here too"? Not even close. If you find your self a 4 wheel drive f250 5.4 you will still find many great things about it! My truck did very well and I was very pleased. It was geared just fine, I loved having a straight axle vs ifs on the 150's, and the weight of the 3/4 ton has it's pros when using 4 wheel drive at times.
Look, I had a 93 full size Bronco, a 73 Ranger with a built up 390, and I went from a run down 1980 4x4 chevy luv to this rig. I know I'm not gonna win races but you will learn to value what the f250 can do for you even if it's running a 5.4.