let me guess at your contradiction.

all metals have their own expansion rate, 9310 (cam), 4340 (pushrods), C.I. (block), Al. (heads), etc.

GENERALIZING HERE! (actual rates can be found)
say the 9310 has an expansion rate of .0005 per inch per Xº. so the cam may grow .0005 from it's center of mass.

say the C.I. has an expansion rate of .001 per inch per Xº. so the block may grow .003 from it's center of mass.

say the Al has an expansion rate of .0015 per inch per Xº. so the head may grow .003 from it's center of mass.

so now the rocker "may" be .004-.006 farther away from the cam.