Worst Engine: 1949 Crosley Hotshot!
The first postwar American sports car had a .75-liter four-cylinder engine which was not made from iron, but from stamped tin. You can imagine what happened when the welding came apart...which it did. A lot.
(Note on photo above: That's actually a 1951 Crosley. If you've got a photo of a 1949 send it to us at tips@radaronline.com)!