Adjusting the rocker arm pre-lash with the motor running has got to be the single worst way.
Probably why no shop manuals, and/or any valvetrain/camshaft mfg. recommend, or even suggest it be done this way. More popular 30-40 years ago with flat tappet camshafts. On roller cams it's easily...
Never did it before messing with liters? Gee, wonder if this has something to do with this "issue". Have no way of knowing how the valvetrain was adjusted. If done with the motor running? I can practically guarantee that many (if not most) are adjusted differently from each other, and wrong.
Have you at least begun to suspect these "noises" have zero to do with ADVs on oil filters since all of them do it on your truck? Combined with we don't seem to have this issue regardless of filter?
Deleting EVAP is beyond foolish. Gas evaporates, and separates. The tank accumulates condensation, it's all bad news. No upside of any kind has ever been found.
If anti-drain back valves fail to the degree this thread's poster claims?
Where does the oil that drains out from the pan when the filter is removed come from?
Installed a pair that came with bolt-on brackets. Installed in a small hole at the bottom of spring shackle. This allows them to be at a 45-degree angle to the rear. Lighting up the rear as well as the rear sides.
So, I take it easy for the first 30 seconds. Closing in on 200,000 miles, and knowing others with double that without any apparent resulting damage after 25+ years.
The identified cause of the noise has little to do with clearances, and more to do with Vortec pistons having shorter piston skirts. In any case, it hasn't prevented many of these motors from reaching 3, 4, and 5 hundred thousand miles.