Valve Lash - Hot or cold?

First few times I did it cold and then with the engine warmed up but shut off and my engine always ran rough.

Used slantsixdan's procedure and my engine ran much smoother. IMO it's easier to do it this way over the engine not running. People think they're going to get oil everywhere until they try it and realize that oil doesn't spritz out at all when the engine is idled down.

https://www.slantsix.org/forum/viewtopic.php?p=72139#p72139