I currently have 882 casting heads with 9.6 -1 cr.. thats with 76cc heads, im getting patriot freedom series heads with 64cc chambers, can anyone tell me what my comp ratio will be? thanks

 

Yes... if you'll tell us what pistons you're using or at least what their dish or dome volume is including valve reliefs; what the deck clearance is (how far down into the block they are at TDC; and what head gasket you're using.

Without knowing all that, you also would have no way of knowing what your CR is now. Looking up in the catalog and seeing the pistons are sold as "9.6:1" or whatever, is NOWHERE NEAR accurate enough, due to all the production, machining, assembly, and parts selection variations that are possible.

 

Not too sure on all that stuff... Just going off what I was told when I bought the car.. its all stock except for being bored .030, gonna pull the old heads this weekend.. could you give me a well educated guess?

 

http://www.kb-silvolite.com/calc.php?action=comp

you can play around on this thing...

 

I doubt you have 9.6:1 with 76cc heads. Once you pull off the old heads you can measure the deck height, measure the piston dish size, and then we can help you out.