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See this is where I get into trouble explaining it. They say "Well if the pushrod is expanding and getting larger and the roller tip is expanding then the lash will become smaller(tighter) as the two metals "grow' towards one another as they expand!!!
Mike

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The pushrod is expanding at a smaller rate per material and it only see ambient temperature inside the valley. The block and heads see a much higher temp from combustion and higher thermal expansion rates. The roller tip expansion is almost nil.

ask someone who has an aluminum block and aluminum head Hemi about setting lash cold.

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LOL

Even a wedge...
My all aluminum wedge engine expands a ton..I set it .005-.007 cold after it heats up it measures .020-.022 hot...

Indy Maxx block,Indy 440-1 heads, individual paired Jesel rocker system, Manton .120 Wall pushrods.