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and will tell you all you want to know. BTW, headers do NOT automatically add HP to every other NA motor in the world. They only help if the stock system is restrictive to flow in comparison to the header. And even in flywheel dyno testing, it is very easy to lose HP with headers and carbs that are way over the needs of the motor. Another thing to think about is that the Z motor is pretty darned efficient to begin with. So those other items are tweaking in its case, not building.
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