I'm putting together a 400 with KB240 pistons, stock rods, 383 steel crank and when I cc'd the heads on the 4 corners and they came in at 87.6 and 88 on one head and 87.6 and 89 on the other. I need to cut them to make them straight but wanted to know what amount of cut will equal cc volume. I thank you very much for your explanation it's awesome. Basically it will be a 9.25 comp 400 for fun driving in my 79 Magnum, I use my 73 Blue Duster for track use