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The steel valve cannot be expanding more than the Aluminum cam carrier or Aluminum head. The steel holds on to the heat longer, too. Valve lash immediately after shutdown should be the same as running at operating temperature.
When the engine is still, it is heat soaking since the oil and airflow has stopped. This causes temperatures to spike a little while after shutdown. Lash should be the same or greater as running, assuming lash grows with increasing temperature.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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