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Engine #3.

The B-24A used Pratt & Whitney R-1830-33 engines, which were less powerful than the engines used by the later models of B-24; they also had round engine cowlings. The engines were later upgraded to turbo-supercharged R-1830-41 engines starting with the XB-24B, which introduced the more familiar elliptical cowlings.

Looking at this picture, you'd almost think it was a B-17 :-)