To set the adjustment tighter cold and come out right after warmup, the height of the block would have to grow more than the length of the pushrods does. The valve stem would also have to stay the same, and/or shrink. When both the pushrod and the valve stem grows, the clearance gets tighter, not looser, at least in my world.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!