Does anyone happen to know the approx cc on a set of 518 heads,,,,,,,,,,,,,,,,, they will be cc'd befor insallation, but was trying to get rough idea of fnal CR, and whether I would have to get my intake planed, the pistons that I have are 10/1 at 78 cc, and that is about the final CR that I would like to end up with,,,,,,,,,,currently the heads are brand new, and the intake has not been touched other than gasket match, and I really hate to start grinding it away