Ahmet, I hadn't read your prior post before I submited my last one, you may very well be right (in fact, I am sure you are), I do know that the earlier 16V head fits (as you said) because I have looked into it with Huntley and Powerhause, and they stated that they are always looking for the 16V head for that type of modification to the 951's, however, I was not aware that the S, and S2 heads were different in passages, (learn something everyday).
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