Why bother with the cam at all? Pull the cam, cam chain, and valves out and weld on threaded bungs for checkvalves on each cylinder. Then, just backdrive the engine with another one. Or, if you were really creative, do it to just 2 cylinders of a V-8, and use the remaining 6 cylinders to drive the other two. I think a BIG flywheel would help with vibrations.
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