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You are correct about the expansion of the aluminum. However your conclusion is wrong. As the aluminum gets hotter it expands and moves the rocker arm away from the valve. The rocker arms are suspended in an aluminum housing. You can readily measure a difference by doing a valve adjustment check on a warm vs cold motor. The first time I noticed this was when I set my valves to .004 on a 40 degree day. The engine was noisy after that and I checked my clearance on the engine when it was warm (had run a couple hours before). Clearance was around .006.
-Andy
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72 Carrera RS replica, Spec 911 racer
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