308 head Q

308 heads have the same chambers as other 360 heads.It's an open chamber head so somwhere around between 65 and 73 cc is chamber size..With a 65 cc chamber comp is about 10.5:1.73 cc will get you about 9.6:1

Can play around with it by varying gasket thickness.That cam will bleed off a certain amount of compression as well.

I used a quick calculator on the kb websight to figue this out.Not really accurate but will give you an idea.