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So how many submarines are being considered for replacement. The three big “V” boats, Argonaut, Nautilus and Narwhal had MAN engines. [3 boats, 12 engines] Maschinenfabrik-Augsburg-Nürnberg (MAN) was a German company thus replacement parts would be difficult to obtain. Cachalot also had MAN engines. [2 boats, 4 engines] Cuttlefish had NELSECO engines (New London Ship and Engine Company) which were no longer being manufactured. [1 boat, 2 engines] There were Winton 201 engines in Porpoise (SS-172) through Permit (SS-178) [7 boats, 28 engines]. There were 80 HOR engines in scattered through the Perch, Sargo, Salmon, Seadragon, Tambor, Gar, and Gato Classes from Pompano (SS-181) through Pargo (SS-264) [20 boats, 80 engines]. This gave a total of 33 boats with 126 engines that needed engines replaced. Note that Cachalot and Cuttlefish had two engines each with the rest having four engines each. Dolphin was a special case in that she was a fleet type with the same engine/generator configuration as Argonaut, Nautilus, and Narwhal (Alden).  It was decided at some point that Dolphin would not be re-engined.