I'll pick up where I left off at polishing the combustion chamber. Then I CC the chamber to find the size and calculate how much to mill in order to get the desired static compression ratio.
And there you have it! There is much more that goes into them that I didn't show in detail here. Port size, shape, bowl size, valve job angles and depths, flowbench testing and port speed, etc. These heads move over 280cfm @ .600" @ 28". Necessary to make 120,130,140+hp depending on the combo.