Magnum Heads

I wish mine were 60 cc's, they measured 66 cc''s. I have to cut them done to 58 cc's. I don't even know if they can be cut that much. I'm going to use Crans's 1.6 chevy rockers too. Check the clearance between the bottom of the rockers and the stud hex. Don't use the chevy size stud, there is a magnum specific stud with a very thin hex. I know that Hughes Engines and Comp Cams has them.