Cc'ing a head tools?

JoePole1 said

Not sure I am understanding this.....
"Calculate the volume of the cylinder as if it were a flattop with no reliefs, then cc your cylinder as if it were a cyl head, and compare volumes."

My H655CP pistons are below the deck. So I would drop them in cylinder to x depth, fill with fluid, measure and calculate volume. Does it matter that my pistons are dished? How does that factor?
Piston Head Volume (cc):
+11.23cc

View attachment 1715769144

Click to expand...

If those are your pistons, and you know the dish volume, (and you believe the numbers) you dont need to cc the cylinder. But accurate measurements need to be done if you want an accurate comp.ratio.
You need to know the cc of the heads (should cc those), how far down the flat portion of the piston is from the deck (deck height) head gasket thickness (to calculate volume), and of course, bore and stroke.
Once you have measurements, most of the piston manufacturers have c.r. calculators. I like the one at Wallace Racing Calculators.