This is what I expected so far. It seems like the closing clearance can only open up with heat since the valve will grow, but the growth of the head from the seat to the cam shouldn't be an issue due to the 90 degree closing rocker (I'm speaking of the 4v motors, I've never been in a 2v one).
A guy I used to race with that had an air cooled supersport said that he used to set the closers tight enough so that none of his feeler gauges would fit in the gap, but he could spin the shim with his finger. Effectively 0 clearance, but no binding.
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