4 inch stroker cam size question

I get that, what I'm saying is that I assumed 8cc for the reliefs and that was the figure I used for initial calculation...then I looked at KB's website and according to them, the Icon 408 flat tops only have a 5cc relief. 3cc isn't much, but it would definitely cause an increase compared to my first calculation using an assumed 8cc

EDIT: I just re-ran the numbers in my preferred compression calculator

Bore 4.030
stroke 4
head gasket .039"x4.1"
deck clearance 0"
skirt clearance 0.003"
Distance to top ring 0.31" (very arbitrary number, but a reasonable assumption)
valve relief 5cc
combustion chamber 65cc (as advertised by Edelbrock)

CR = 11.6:1