I posted on the Smokestak site and a guy there knew what it was. I could have hunted for a long time. It was a stout engine for the time 1919 to 1923 with 178-181 ci (from different sources) and 55hp. It won the Pikes Peak race in '23. There is a '23 race car In Reno at the car museum. I'm going up to take a look.

"I wonder if God created man because he was disappointed in the monkey?" Mark Twain