Does anybody have any first hand update on this? I joined just to post that my 2019 Trail Boss Custom 5.3 makes this exact tapping sound. I currently have about 11,000 miles, but it has done it since I can remember. It only does when the engine is cold, such as sitting overnight or starting it up after work. It does not start tapping right away, but once the idle comes down. The tap doesn't seem to have any particular rhythm and will go away after driving it. I have seen others on this forum with the same tapping with V6, the 5.3 and now the 6.2, but with no real update. I've seen posts saying that the dealer replaced lifters, but that it did not fix the noise. I would appreciate any insight.
-Nick