No you'll have to (and hope for) a mechanics response. I'm a student!

The 2CC/0.5CR unit is approximate so don;t go by those figures.

Seeing as the cylindrical dish is a cylinder we have a constant shape from which we can calculate volume (as you reduce it's size). Simple mathematics really, calculate the volume of the cylinder by determining it's radius and depth. And then go from there.

I have the calcs for my H75 cylinder head but I've left my book with the machinist.