What I just wrote about the 16V head not being beneficial unless making 400hp+, I don't know at what point it actually is a plus, the pros that have done this (Huntley, Powerhaus, etc...) say that unless you are making "big" numbers in hp, (usually 350+ at rr wheels), you won't notice much, but, once you get the big numbers, that it makes a hell of a difference. I have a 16V 2.5 liter S, and was considering swaping a complete 951 engine, but keeping my 16V head, I have talked to Huntley and Powerhause on this, that is what they said.
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