Hi Chuck,
Not a make, but a custom casting. I wish I could claim more credit but I must let you know I am more of an apsiring protege. I am "allowed" to turn flywheels, mill parts to spec, and cuts parts on the bandsaw.
To the more accomplished members I might be more properly described as a collector, but over the last five years I have had the pleasure to observe and sweep chips in my neighbors humble shop.
I wish I could contribute more to the forum but I am far from expert and my experience is limited to how it is done in "Herb's Garage".
I have about twenty examples of my neigbors work and have seen another forty or so got out the door. If I haven't been lied to ( and I believe, I have seen some go from raw stock to running in a week) there must be close to 200 engines ( of various styles) out there.
Here is another example of the casting in question.
If you have more specific questions (or would like to hear a tale or two about my neighbor) let me know.
As the weather gets better I hope to run them all and post more videos.