the engine itself is an HS40, dont use the number stamped on that shroud if you end up needing to order parts. I have some tecumseh documents that show the engine numbers that were supplied to manco and a few other companies in that time period, if you have to pull the shroud and flywheel to change/set the points etc.. to get it running message me and let me know if you have to use an 11/16" socket or a 3/4" socket on the crankshaft nut as that will determine the engine number as those were right at a transition time on Tecumseh engines.