After we dyno an engine, I always listen to them, with and without ear muffs...especially around the valve cover area. There was no noise at that time...and if there was, this engine would have been super easy to fix a lifter issue, as we removed the intake manifold and shipped it without it (Marland was using his intake). So that would have been really easy to fix. Sorry for your troubles, but honestly it was fine when it was shipped. Don't know what else to say....