adding metal and re-opening heads

[supavert]

What's up everyone?

This is supavert. I have a nice set of porsche type 4 heads with big valves that are already cut out to 103mm. My question is, can you weld new metal were the heads were cut before, so that you can go back to 96mm? I would really like to keep these heads. I was going to build a 2366 but after gathering all of the information about the project I've decided to build a 2270. So if that can be done please help me out. Thanks, Peace!