Valve Lash - Hot or cold?

Bewy said

If there is a difference between how the engine runs [ smooth or rough, post #13 ], it means the lash is different between both methods.
I suspect with an all iron engine, there will be little or no difference between the hot/cold setting.

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On a V8, it is about .002 larger when cold. That is with small block cast iron heads and factory rockers. Will it make a difference, who knows. On a six, probably less change in gap. If I'm going to run a solid cam, and I always do, why set the gap just close enough? I'm not running "Stock Class", I'm going to set it how the cam card tells me to.