Cold valve lash setting - tighter or looser?

[FishFry]

Just saw that video, and it got me thinking - have I done it wrong all those years?
It goes against anything I learned, but the proof seems to be in the pudding.

Common sense tells me that the pushrods/valves extend when they get hot, but I guess the block, the head and the rocker stands expand much more than the pushrods, valves and lifters etc.

Frank

 

[Grumpy]

interesting, but Ive almost always set final or operational lash with the engine at idle once up to operational temp.
setting the lash on the loose side during the initial start up is generally a good idea.