Quote Originally Posted by Duramaster View Post
Why the re-reing?
This was an older thread, but I recently spent time inside a 140K mile Duramax, and saw that the crosshatching on the cylinder walls looked to be untouched by ring wear. The upper portion of the cast iron cylinder walls were induction hardened at the factory. You can see the pattern produced on the cylinder wall surfaces from that process. Now, if the rings have a similar wear resistance, the engine should last... a long, long, long time. I've discussed two trucks here in TheDieselPage.com that each accumulated 750K+ miles without any serious engine work.
Here's one of those stories: https://www.thedieselpage.com/duramax/750kduramaxc.htm

By the way... the intake/exhaust valve lash specifications call for .012" clearance each. Easy to do, just a bit tedious.