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Rotary valves. The sealing issue, I read a few years back, has been solved by 2 independent companies, but I digress. You have two rotating horizontal tube "valves" across the tops of the head(s) for intake and exhaust (that could be controlled electronically for what would essentially be variable lift and duration, perhaps not even needing the tube to fully rotate, only variable degrees back and forth, but the mechanics of that sound unreliable at best). Within each tube, for each cylinder, there's a vertical tube valve that opens to the cylinder when the tube is rotated to position. The air would enter or exit at the angle determined optimal for the shape of the combustion chamber within the head. Potentially, there would be much more air flow as the openings would be much less restrictive and larger, but I don't know what that actual dynamics of the air flow would be, especially while the valve was rotating and creating an irregular chamber, but it's all just an idea anyway.
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