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Most likely the owner was interested in more performance and had the later year engine installed. The trick here is that when the engine was sold OTC, vehicle information needs to be supplied and FORD should have caught the earlier model year chassis there or within a short time.
I now see the possible motivation for the upgrade -
Now that would be a serious undertaking. A dealer wouldn't touch it as is it is not R&R and will require modification(s). It would also be on a cash work order and they could really jack the up labor and parts as work progressed.
It would have to be done by one hell of a specialty shop.
A sad situation that bleeds cash. This will sell gas motors like crazy. Good luck Op. You’d would think both shops would have insurance to cover such issues.
Had another ”reputable shop” replace the engine with a brand new 2019 Longblock from ford parts, 2019 BrandNew Turbo from Ford parts, had everything redone.
$15,000 and 3k miles Later, I started to get coolant in my oil slowly. Coolant levels depleting slowly. Loud ticking in the engine. It’s been back to the same shop 4 times and they have an excuse for every problem such as “the milky oil must be from condensation in the crank when we had the engine off”. NOTHING is under warranty because the truck has been fully deleted since 40k miles. It is now at 150k.
As of yesterday, I was down 2 quarts of oil, coolant continuously added, heat stopped working same day, ticking noise getting louder, and if I remove the oil fill cap with engine idling I can hear a burst of air come out with white vapor/smoke.
It sounds as though this shop is incompetent. The only solution I know is starting to negotiate with a trusted dealer (if you can find one), after trying to have the shop contact FORD for a warranty claim. If they are not willing, you have no alternative but a dealer.
The excessive crankcase pressure sounds like (to me) a CCV problem. It is all dependent on how the installer went about the retrofit. The coolant problem should be easily diagnosed.