How much can a stock 1200 head be milled?

[Turbota]

Just wondering how much a stock 04 1200 head be [safely] milled without having piston to valve clearance problems when stock cams and pistons are used?

One other question: Since the stock CR is 9.7 to 1, what would the CR become with the heads milled that much? (still using stock CCs in the head chambers)

Thanks,
Ron

[barry1967]

Head chamber is 62cc's. I only took off about .005 or .010 and i used a .030 head gasket and now run N3's. So your safe to that point.