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Couldn't find anything that was "loose" or indications of improper movement/operation. Lobes were smooth and relatively clean. Added some additional image folder links below. Thanks y'all Valvetrain Inspection Before Removing Camshafts - round 2 (after first 4k miles with the tick)...

No, it sort of drowns out with higher RPMs/load. I put about 4,000 mi on it before pulling again and didn't notice any indication of exhaust leak. Put another 2000 miles on after pulling again to work on the lifters. Blackstone analysis came back just a couple weeks ago.

No codes, runs great, smooth power delivery. Feels like it should, just does not sound like it should. I either replaced the individual followers (3 per intake lifter, 2 per exhaust lifter) or removed and reinstalled. I made sure each follower moved smoothly. Some were more "stuck" than others.

I'll give this another go, didn't realize I was holding the stethoscope wrong - thanks!

No high pressure fuel pump on this one, that's reserved for the RS4/R8 variants of the 4.2L, but thanks for the thought!

I've been chasing a constant tick since first installing a junk yard replacement. Did a full timing chain job on the replacement engine before install. Have pulled the engine one time since and disassembled/cleaned all lifters to no avail. Blackstone analysis is pretty clean, no indication of...