Secret Speed Project #1 (post 2)

Here at the Old Speed Shack we have a lot of things in the pipes right now. And much like my sink it all gets backed up every now and then. So just to keep the project fresh in my mind ill post a small update on the SSP1. It is a close up of the chamber and valves on one of the heads that will be used for this project. They are going to be taking a trip to the bead blaster and be rebuilt before they go on the motor but this is what they look like in there present state.

Any guesses to the valve sizes?