The F6F Hellcat, the P-47 Thunderbolt, and the F4U Corsair all used the 46L 18cyl R-2800 Double Wasp engine.
(A bomber engine in a fighter...)
https://en.wikipedia.org/wiki/Pratt_%26_Whitney_R-2800
(For reference, the B-25 and the A-20 bombers used the smaller 42.7L 14cyl R-2600 Twin Cyclones)