I'm into the fiddley bits now so progress will probably be slower and not very exciting. I had decided to use 3-48 SHCS to fasten the two halves of the valve body assembly to the base. However, after I drilled and tapped the holes, I found that my screws were too short. So, I made some brass screws from a piece of hex rod I had on hand. Screws turned out nice:

But, when I tried to tighten them down, I promptly twisted one off. Guess brass was a bad idea in these small sizes. So I drilled out the holes and tapped them to 4-40. Had the right size screws on hand and screwed the valve assembly to the base:


Next I started on the timing gears. The small gear is made from two pieces, the gear and the hub. After the gear teeth are cut, the gear will be bored out, then loctited or hard soldered to the hub / collar. Here I've turned the gear blank and the hub at the same time from a piece of 1" 12L14.

Next I'm parting off the hub:

Here's a picture of all the gear blanks. The large timing gear was turned from cast iron and will have a pitch diameter of 1.5". The small gear is mounted on a mandrel, ready to have the teeth cut:

Today's work will include cutting the teeth on the gears and getting the smaller, primary gear assembled into one piece. Then, it's on to the cam.
Chuck