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Hey Mike what do you think about a slide valve throttle like the original?
I think that fuel injection may be possible Manifold injection requires a lot less pressure than cylinder injection.
Would there be enough height to make round slide valves rather than flat, much like you get on high end RC Car engines? A lot easier to seal and you could have one rod with the six holes in it per side.
Perhaps you could get one injection pump to squirt all 12 stacks simultaneously. But first you need to get the engine designed.Mike