CCing a 223 head

[p38fighter]

I am modifying my 223 for a little extra performance. Does anyone know the formula for effect on CC volume by milling the head. For example if the head is milled .030 how much is the CC volume decreased?

 

[59Orphan]

I milled my head 0.10" (67cc). I am not sure what is was before. The head was not that striaght to began with, but i think .007"=1 cc.

I was trying to keep the compression at or around 8.3:1
Maybe someone elese will chime in.

 

[bubba22349]

Just a guess but around 4 to 4.25 CC's on a .030 cut of course each chamber is going to be a little different size too. They would need to shape or ground to match each other so you would still need to CC them to know.