Danimal08
Newbie
There was also a TSB I think I remember reading a long time ago that also when I was concerned about this very noise that discussed having to measure and replace main bearings in .001 sizes to correct a bottom end knock (I'm 90% was warranty complaint related)...dont recall the details exactly, but GM may have had some tolerance stack issues in the cranks/blocks that had some excessive clearance on some of the journals. As a guy who spent large amounts of time scouring warranty data for an OEM, I interpreted it as "this'll probably get it out of warranty"