Cylinder head casting marks?

[mcgarrett]

Wondering if the casting marks on this cylinder head have any special significance? Is this an aftermarket head or replacement head made by Ford?
No other markings that I can see. The photos show squares cast into the head at the front and the rear top surface. One pic shows a circle with dots superimposed onto one of the circles. Also has Made in U.S.A. cast in the center of the head. Just curious about those kinds of things.