Lets start here. The thermal expansion rate of aluminum (all types) ranges from .0000117" to .0000133" per inch, per degree F temp change
So a distance of 7.08" (aluminum rod for example) changes temp from 70F to 200F it will grow in length .0108" (7.0908") with an expansion rate of .0000117
and it will grow in length .0122" (7.0922") with an expansion rate of .0000133.
Next, a distance of 10.725" (std RB/Hemi deck height) changes temp from 70F to 200F t will grow in length .0163" (10.7413") with an expansion rate of .0000117
and it will grow in length .0122" (107435") with an expansion rate of .0000133. for a difference total of .0022.
That is a crossed the spectrum of aluminum types and grades.
With out including Piston height growth and a 0.0" piston to head clearance you would have a .0008" clearance or a -.0008 interference.
Anyone here sweating .0008+/- compression height variation?
Yes I understand this is a very basic example but the numbers still apply. Even if the block and rods heat to to different temp Deltas the growth numbers are still small relative to the basic clearances of a typical drag motor...Now if you go F1 racing, this stuff becomes important.
There has been no consideration taken for the expansion rate of steel (Push rods, Fasteners, lifters etc...) (about half that of aluminum) but that is a different question and where the introduction of an aluminum block starts to show.
Traditionally the main concern with aluminum rods is dynamic stretch that is effected by piston assembly weight...again not considered here.