Looks like it was hit with a grinder when someone, at sometime was working on it and had trouble removing the screws. Carb will likely need cleaned or rebuilt.
I will double box and pad this engine as it weighs nearly 30 pounds. The item "1946 Schwinn Whizzer Motor Bike Engine Model H 4 Cycle Air Cooled Vintage WMH-20" is in sale since Sunday, October 18, 2020. This item is in the category "Collectibles\Transportation\Bicycles\Bicycle Parts". The seller is "tchvintageselections" and is located in York, Pennsylvania.
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