When you get to large engines, you see many unusual combinations. Also, parts are so large that things like the crank may be constructed from multiple components. Decades ago, I designed controls for large stationary natural gas pumping engines. They ran on the natural gas from the pipeline, were 2 stroke, but had valves, plus ports in the cylinder walls. I vaguely recall the ports were for intake (after a compressor & throttle) and the valves for exhaust. Don't recall if the compressor was turbo or crank driven). Even the connecting rods were different, with one attaching to the crank and its V neighbor attaching to it above the crank. It was spark ignited, but was controlled more like a diesel by adjusting fuel flow, w/ the throttle usually wide-open. They can do this because natural gas has a much wider flammability limit than gasoline, so can still ignite when very lean.

BTW, people get confused in numbering V engine cylinders. They should be numbered front to back in the order they attach to the crank (recall Ford doesn't do so). But, in this engine the V cylinders were directly opposite each other.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans