But I think if I were going to try to do this, I would forget the cam and and remove the cylinder 3 and 4 push rods on an overhead valve engine. Then build a bridge between rockers for cylinders 2 and three so cylinder 2 intake would open cylinder 3 intake and cylinder 2 exhaust would open cylinder 3 exhaust.
Then I would modify the rocker shaft so it is free to rotate, and consists of a shaft in a shaft. The internal hollow shaft should be fixed to cylinder 1 and 4 exhaust valves, and the external shaft is fixed to cylinders 1 and 4 intake valves. You might want to reinforce the push rods but for no more hours and low speeds you should be running it, the cam, lifters, and push rods should handle the load.
If you were going to try to modify the cam I think I'd get two cams and put another front section under 3 and 4, and instead of welding together, come up with a coupling type joint so each shaft can self align. Then all you have to do is regrind the rear shaft bearing journals.
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