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I ask because I am trying to get a good picture of what power levels I am dealing with and so I can build a good model of my engine. I have been surprised, as the simulation so far has shown only about 10-15hp in going from manifolds to headers. What size headers to people normally use?
 

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I can believe the headers would only add that much to a stocker......any one upgrade doesn't change the world.....combine several key upgrades and watch out!
 
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lift(valve int) .360"
int opens 16deg btc, closes 70deg abc
exh opens 44deg bbc, closes 20deg atc
 

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