The engine I have is a big block 251 CI from a Desoto.
Here is a Dodge truck with the dual setup. This truck belongs to George Asche a friend on mine in Pennsylvania.
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George Asche has this big block 265 CI engine in his 1929 Desoro.

Here is a shot of the other side. Note the dual charging system for both 6 and 12 volts.

And here are a couple of shots of the 30 cylinder tank engine based on the flat 6 design. I wonder what this sounded like when it was running?

Enjoy, Don Coatney