This is a very large steam engine.I could not find any markings for the make of the engine.The overall length of the engine is 29" long and weighs 200 pounds. This engine can be a work horse. I do not have a boiler larger enough to operate it. I have had it operating on air. The bore is 4" with a stroke of 3". The sheave is 22" in diameter. The sheave has a broken area that could be repaired. This is shown in the pictures. The shaft diameter is 1.5". The steam ports are 3/4" and 1".