To answer Bobs question from another post,first I didn't make that post to knock the Cummings, and for sure Ford has had back to back miserable engines, 03 was the end of the 7.3 and I got one of the last, aside from the trans. I had no trouble with the truck, that is until that most miserable of days about 2 months ago. The motor broke a rocker arm and bent another, and made a whole lot of noise when it did it. After I got the truck back here I had a very capable diesel guru listen to the motor, he was sure it was a rocker. So I tore into the driver side first, uh oh not this side, so now I have both sides opened up and find the problem, I'm pretty busy getting ready for crabs and just park the thing for a while, besides I'm pissed at the thing, then I fall off the roof and break my left wrist, more delay. In the meantime I ask everybody I know and do a web search to see if this a common problem, well maybe if the motor has a couple a hundred thousand miles on it, but mine is no where close to that, the only thing we can think of is too much exhaust brake head pressure, so that must be it, if the brakes aren't set correctly it Can happen. After a couple of weeks, my wrist felt better and I removed the rocker ass. and push rods, and decided now would be a good time to remove the heads and get the things flowed, so I sent them to a shop in Redding who did the job, they do lots of diesel performance work, Gees those heads are heavy, really hard in and out, chucked the head bolts for studs, another almost impossible job without the cab off. Put the motor back together with all new push rods and a set of roller rockers. I still-don't have any skin on my knuckles, but the motor never ran better, I haven't towed with it yet, but I'm pretty sure my EGTs will be lower under load, and I noticed right away that the motor spools up much faster. Still have no idea what caused this to happen, after the truck was running again Dustin put it on a chassis dyno. and the exhaust brake would only make 42# of head pressure, well within the safety zone, so In the end I may never know what caused this to happen. One word of advice, if this happens to you, before you start take the cab off the truck, lifting those heads in and out of that hole can kill you.