This engine came from New Mexico so is probably made in the USA. It stands 9.5" tall and has a bore x stroke of approx. 1.5" x 1.5". It will not run on air as the valve gear and connecting rod are too heavy. I hope that with a flywheel it will run. The crankshaft diameter is .5".
I would love to know who made it and how old it might be.
Thanks for any help.