Originally Posted by opelbits
I guess the question here is what sort of header is wanted? A nice header for a stock/mild motor, or one that gets the most out of a hi-comp (10.0 +), big cam, big valve, big carb motor? Can it be the same header for both?
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No way.
Any header that claimed to be such would only be a "combination of compromise".
There might be a certain RPM that it would work well on either engine, but it wouldn't be the same RPM on both.
Chances are that it might be better at most RPMs than a stock manifold, though.
Header design is an exhaustive science, no pun.
Smokey Yunick said in his autobiography that no man could live long enough, working at it every day, to understand and perfect the science. So far the best anyone has done is get the perfect header for a specific RPM that stays extremely effective within 400 RPMs of that specific, tuned RPM. See them at NASCAR. Step headers, suddenly now the rage in our Mini/Compact (Mustang, Pinto, etc.) class.
And he played with it a lot. For many years. Had some pretty interesting innovations in that field!
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However two Mustangs, a Pinto, and a Capri were hospitalized.
One Mustang was euthanized the next morning.