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I would have probably just ground down the camshaft for the valves associated with cylinders 1 and 4. That is, assuming that the valves were directly driven off the camshaft instead of using a rocker arm or some other method of articulation.
The pistons inside cylinders 1 and 4 would effectively turn into springs, as they continually compressed and then let expand the air trapped inside them. You would also still have all of that mass to offset the 180 degree out-of-phase mass of the pistons and conrods for cylinders 2 and 3.
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