unknown holes in heads

[GoMangoBoys]

I know you guys are gonna think I am an idiot, but this is my first Mopar engine.  What are these crescent-shaped holes in the heads?  Will the valley pan cover these holes?  This is a 383 with 906 heads.  We are getting it ready to paint so that assembly can start.  Should get the paint on tomorrow.
Thanks.

[1 Wild R/T]

It doesn't get covered... They are just open space around the heat crossover, they don't go anywhere.... Nothing to worry about...

[Chryco Psycho]

It allows a lot of the heat from the exhaust crossover to escape which is good , you usually find some small carb clips etc in those holes .

[Brads70]

I suspect they were designed to catch various hardware, tools etc basically anything you DON'T want to fall in there.....

[68bee]

Thats where the mice live in the winter