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There is nothing i can think of that a compression/leakdown test wouldnt tell me about. Any ideas?

I figured of the things that could have failed on such a job, those were among the better. So I replaced the valve seals again. This time with the heads in the motor which is no easy task on a ford 4.2. Still smoked white/light blue on startup, and at high rpm's. compression was normal, and 150-160 psi across the board. must be valve seals, Right? Replaced them again, treating each one with the care of a newborn baby. STILL!!! Smoke on startup, and at high revs. still using/burning about a quart of oil per 40 miles. could this be an issue created by exhaust back pressure? I'm dead sure I have plenty of that. If not before, these cats have to be a solid chunk of carbon by now. What would you do next? do you think it could be the head gaskets? I think only coolant goes through the passages in the cylinder walls. The ones that pass through the head gasket. coolant could explain the white smoke. but I'm not loosing coolant, I am loosing oil though, with absolutely no leaks.

Sorry< I didn't see this reply until now. Yes, the motor is still running to this day. it does have another issue now though. maybe you can give some advice? I did the head gaskets on it back in June, which seemed to have gone well. All except the valve seals were leaking.

Hello,
Your post from way back on the fog light install is very helpful. Sorry to dig this old thread up but I am now trying to do this install on my 2003 f150. I left a reply on the thread, if you would be able to take a look and see what you think I would be very grateful. Thank you

here is more info on the issue: https://www.f150online.com/forums/19...me-please.html

Hi,
I would first like to say that I loved your write up on the timing cover gasket replacement procedure on your 99' 4.2L F150. Seems like you know what you are doing. so my question is this:
There seems to be some question on whether or not my timing chain has slipped. does not seem common on the 4.2. but always possible. another member lead me to believe that the harmonic balancer and crank "keyway" can break and slip time leaving the engine off time electronically speaking, but not mechanically.. i definitely want to rule out that the timing chain has slipped, as well as the the harmonic balancer keyway. so, back to my question. if i stuff something down the #1 spark plug hole, and rotate the engine to the top of the power stroke for that cylinder, will that reliably enough tell me where TDC it to say that. If the harmonic balancer TDC marks line up at that point. not only is the keyway in time, but the timing chain has not slipped?

Hey! I just read up on your post about your fog lights that you did a few years ago. ...any chance your want to build 2 of those braces for me?

Well thank you! Definitely appreciate the info. I'm trying to do the same easy setup myself.