Passage: The P-38F was followed in early 1943 by the P-38G, using more powerful Allisons of 1,400 hp (1,000 kW) each and equipped with a better radio. A dozen of the planned P-38G production were set aside to serve as prototypes for what would become the P-38J with further uprated Allison V-1710F-17 engines (1,425 hp (1,063 kW) each) in redesigned booms which featured chin-mounted intercoolers in place of the original system in the leading edge of the wings and more efficient radiators. Lockheed subcontractors, however, were initially unable to supply both of Burbank's twin production lines with a sufficient quantity of new core intercoolers and radiators. War Production Board planners were unwilling to sacrifice production, and one of the two remaining prototypes received the new engines but retained the old leading edge intercoolers and radiators.

Question: What was the successor of the P-38F?
P-38G