I hear what you’re saying . . .
But it boils down to this
You’re using an engine which is only certified for use in Class 4 and above NON-OBD2 vehicles
It would be fine to use the engine in a 2011 Ford F-450 or larger
But that isn’t the case here
By the way, don’t think I’m arguing with you
I’m simply pointing things out 
Being required to report a problem is completely different than being required to fix it, as Whitey said.
In my state, realtors must report to potential buyers any significant problems in the house they are selling. Of course, houses are (generally!) more expensive than cars, but the concept is there. On the other hand, there are probably more ways car problems could physically harm a person than problems with their home.
The important caveat is that sellers only have to report house problems of which they are aware. And as anyone who owns a house knows, there’s plenty of stuff that can go wrong, and you don’t know about it for awhile.
BTW some of the real estate disclosure laws in some states are pretty amusing. In some places you have to disclose if anyone died in the house. And there are some situations where you have to disclose to the buyer if you believe your house is haunted. 
And that kinda drives back to the carfax issue. Some home buyers will care if the house has a reputation for ghostly activity. Others are convinced that ghosts don’t exist, and would view such disclosures as the product of delusional minds.
Some car buyers care if the engine has been swapped. Others recognize that the swap was to fix a problem, so as long as the swapped-in engine is working properly it’s not really any different than any other repair. Should carfax include routine brake jobs? Seems kinda silly.
F450/550 are class 5, 19,500#, but have been OBD2 since 90s and use the 6.7 with non-VGT turbo but same intake and level 3 emissions… Class 6 F650/750 do not offer the 6.7 “Scorpion” block.
Since the ECU was flashed to level 4 emissions, the short block is just a short block, not a complete engine.
Okay, good. That would only constitute temporary insanity cat lady, rather than crazy cat lady. 
CSA
anything class 4 and above is not OBD2
What about HD OBD? From what I’ve found, EPA has required HD OBD on all class 4+ vehicles since 2013 (phase-in started in 2010).
Here’s an article from 2010 explaining the then-new requirements.
Edit: Here’s a table I found from an ICCT white paper regarding global OBD regulations (which was sourced from DieselNet).
It’s still not the same thing as OBD
EOBD and what not are interesting, but they’re still not OBD2
There are important distinctions, as far as emissions, calibrations, etc. go
And that table you listed was for vehicles over 8500lbs GVWR
Luke put in an engine for a class 4 or 5 truck, which is a few steps above the vehicles you listed
If a huge F-750 with a diesel engine . . . for example . . . were OBD2, it would get a smog test
and it doesn’t
it gets an opacity test
Again . . .
I’m not arguing
I’m merely posting information
Amen, brother. Agree with what you said 100%. And then I see Bing is throwing “brick bats” in another thread. Give me a break.
The off-topic stuff is deleted. Please, let’s not go back to this.
I disagree with your decision
You really let him get away with some nasty stuff
I didn’t delete it to give Whitey what he wanted, since you say I let him get away with a lot of stuff. There are some people making on-topic comments in this discussion. I figured if I deleted his post and the comments about it, it would allow the conversation to go on. I decided to go on with deleting, lest someone see the comments and keep talking about them.
Well, thanks for the explanation 
I wouldn’t classify changing breaks to swapping an Engine… I think my biggest issue with this is: The horrendous reviews of the company that supposedly Remanufactured the Engine that wasn’t reported on my Pilot’s Car Fax…
I found this thread which talks about who remanufactures LKQ Engines (dated 2017)…
answer : “ALT” https://atkvege.com/
Thread here : https://www.bobistheoilguy.com/forum…res_the_engine
One poster used some colorful language to describe how badly this company should be avoided.
Couldn’t you have picked a quote that wasn’t so vulgar . . . ?!
Not only is that quote completely in poor taste you are starting to edge close to being a Troll .
Buying used cars, especially old ones like that 06, and with a little rust like that 06 is a bit of a crap shoot and not a game for everybody.
I buy used cars, GM cars, but I do my own car repairs, maintenance, and used car purchasing inspections. I’ve gotten quite good at it. I’d bet I can spot a car that has had any wrenching done on the engine or under hood components. I pass on those, too many unknown, but that’s just me.
I have no qualms buying a used car after I put it through my wringer of scrutiny (which begins on the phone before I bother to go look). The owners grow tired of my inspections, too, but if they balk, I walk.
Unless you know about cars or have a trusted mechanic who does a pre-purchase inspection then you are setting yourself up for some surprises and some of them could be unpleasant.
Some folks would probably be better off buying new or factory certified pre-owned or from a close trusted relative, just saying. I hope what you learned can be put to good use.
CSA
Could the OP have opened and developed this thread in order to trash the source of her engine? Seems unlikely to me. And while I see no point in posting ‘vulgar’ and ‘obscene’ posts here, posting a quote from a thread on another forum did demonstrate just what the public can find when searching for clues to their automotive problems. I hope this forum can remain relatively civil and discreet and occasionally I regret making a snide remark. And I hope that @OverRunWithSons_162328 comes away from her visit here with some sense of finding help despite being used as a back stop for the usual banter here.
I bought used cars in the days before CarFax. My concern was not whether a remanufactured engine had been installed in the car, but how well the engine that was in the car ran. I would short out the plugs one at a time. If shorting out a particular plug didn’t make much difference, I knew the car had a weak cylinder. This was in the days of leaded gasoline. If the tailpipe had a white deposit, as opposed to a black deposit, it was a good sign that the engine didn’t burn oil. I would take the car to a hill and have someone coast down the hill in high gear and then tromp down on the accelerator. If I saw blue smoke when the car was accelerated, I knew oil was being sucked into at least one of the cylinders.
Back in the 1950s and into the 1960s, many engines were near the end between.60,000 and 75,000 miles. Sears Roebuck and Montgomery Ward sold remanufactured engines for many popular makes. A car with 80,000 miles with a remanufactured engine was often a better bet than the same make with 55,000 miles and the original engine.
I can agree with some of what you said
For example, I agree that carfax is a marketing tool
I also agree that people should learn how cars work and do their own research
The other stuff . . . no comment, and it has nothing to do with buying cars, for that matter
