This has a single shaft that is 3/4" x 2-5/16". You can check out the engines listed here to see if you think it will work for you. The newer overhead valve engines have the same mounting but the engines are about 2" wider and 2" taller than the flathead engines (non overhead valve). The width will be 2" wider toward the right side as you are looking at the shaft. You will have to make sure that this width difference will not interfere with anything like the control chute rod.
