The V-3420 is a 24-cylinder double-vee, twin-crankshaft, liquid-cooled engine derived from the V-1710, a 12-cylinder engine that powered such World War II aircraft as the Lockheed P-38, Bell P-39 and the Curtiss P-40.Essentially, the V-3420 is two V-1710 engines mounted on a single crankcase with