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Overall view of the forward end of the Navaho engine.

The sign calls the engine "two-chambered," which would lead one to believe that there was a single turbopump feeding two combustion chambers (e.g., like the Russian RD-180), but here we see that each combustion chamber had its own turbopump. Since there appear to be two turbine exhaust ducts, it seems likely that each turbopump had its own gas generator, as well (although a diagram of the G38, which clustered 3 135K engines, seems to imply that a single gas generator was shared between the three engines).

Rocketdyne: Powering Humans into Space tells that the Navaho G-26 used the Mark 3 turbopump, the same turbopump used on engines such as those used on the Thor and Atlas and well as the H-1, the engine used on the Saturn I and Saturn IB.