OK now I'm confused. I too used to think you would adjust them looser because things would expand and tighten up, then I swear I heard the because the block and heads actually grow that the tolerances actually increase.
The only reason this even started to make sense was beacuse how much my block grows when warm as evidenced by my blower belt getting tighter.
Too many margaritas?
FWIW I always adjust mine hot and have burns to show for it.