Pretty sure they will not work. The reverse rotation does change the timing of the valves in rotation and there would not really be a lot of need to do something bigger for the m120 engine. It really puts out less power per cylinder. They were only like 389hp.
And again.. I think that your time and money could be spent way better than anything with camshafts. Even used parts and gaskets etc. Buying a 3.2l engine or a 3.6 would be cheaper most likely.
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