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Testing has show for a given intake profile they will give a little more power with a longer exhaust duration.


Whose testing? I've seen some that show that the proper single-pattern cam will provide more power through the entire range. So, who do you believe?

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The magic number, here, is 75%.


Sorry, there is NO MAGIC NUMBER. That "75%" rule is outdated.

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Opinions are just that...


I won't argue that point.