Speedmaster CNC chamber cc's

First thing I’d do if I had some SM SB Mopar heads that checked at 75cc...... is double check my work.

I don’t see how you could get another 10cc out of those chambers without radically altering the shape.

If they were indeed 75cc...... I’d send them back....... unless of course you wanted them to be 75cc.

Since it would appear that the cnc’d chambers did come on some assembled heads....... I wonder how SM decides which heads get it, and which don’t.