1994 Ford F150, 4.9L I-6, 164k Mi.
Recently had the head gasket go on me. Compression testing revealed the following, with max PSI attained after about 4 compressions:
Machine shop called today, said head isn’t cracked, but warped 0.017" and they want to do a valve job. Hone marks are still plainly evident on all cylinders. Just before HG breach became obvious, truck was going through 1Qt/5000mi, with a fair amount leaking out the oil pan, lifter gaskets, as well as around the oil pressure sensor (vs all being consumed in the engine.)
Question being: As long as the truck is “down,” what is the consensus on a ring job? I’d measure the bores for out-of-round; if they pass, I’d have effectively a top-end rebuild. (The 7 main bearings is the part of the engine I have most faith in, so I’m okay with leaving them alone.)
I guess what I’m asking is if it is good practice to leave the rings alone at this mileage, coupled with how much additional labor is involved. Can this be done with the engine in the truck (though not necc in the engine mounts)? Is it necessary to split the engine from the M5OD tranny? I think that a decent top rebuild of the engine might result in a truck that can last until I’m too old to do handyman stuff anymore.
(Or, I can patch it together and plan for a new truck and/or engine in 5 years or so…)