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Again, if it were as simple as "lash expands with increasing temperature", then try the acid test (set "near to zero" cold valve lash - the follower will still hit the opening ramp at the design velocity - and run the engine and you'll burn all your ex valves.)
John,
I believe that this test will result in valve failure. But it does not in any way prove that the running clearance is smaller than the cold clearance. Proving the cause of failure takes much more effort. One possibility would be that the actual running clearance opens up, but the amount of seat time is insufficient to get rid of the heat before the surface deteriorates and loses it ability to shed heat. Some things are not so simple.
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Paul
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