Purple Shaft lash question.

yellow rose said
I have never seen an engine with iron heads have the lash close up from cold to hot. I've seen some that opened up just .001-.002 but most open up .003-.004 and aluminum grows on average .006-.008.

The exhausts will close up, but You'll never catch them at their minimum, You'd have to be in the valve cover checkin' while the loud pedal's down!!