What should cold lash setting be?

I know Stock Eliminator guys who run solids even if they
are on hydraulic profile camshafts, they set them at
.004 which scares me. I was just talking to a well know
engine builder out of Arizona this week and I asked:
Are you not scared of burning an exhaust valve for it
being on the seat a shorter time to cool?

He said it was never a problem as he is way smarter than
I am (I am just a hobbyist)! Our cars only run for a couple
minutes so I assume he is correct. But it still scares me.
Air cooled VW guys run them at .000. They just warm them up in the pits.