i'm looking into having my stock heads milled and possibly some bigger valves put in.

few easy question:

1 - what is the stock combustion chamber size?
2 - milling the heads .020" will result in what size?
3 - what are the stock valve sizes?
4 - what is the biggest valve that can be put on a stock head?
5 - would there be a problem with ptv clearance with the cam i have in the sig if i get this setup?

thanks