Found time to map out the exhaust ports. They were all within .005″ or .006″ of where they should have been. A lot of that may have been the toughness of the casting affecting my touch probe accuracy. I can tell you that is pretty accurate for a sand casting.

Here is a shot of me taking a skim pass for port matching to the flange.
You can see I have a little hand work to do on a couple of the combustion chambers.Exhaust

Exhaust side all done

Tomorrow I start on the valve guide bores.