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i going to buid a set of headers for my sbc with a lot of nawz(i put that in there so the ricers could understand me) and was wondering if the length of the primaries needed to be equal or would it matter with that much spray, Also what type of collector would work the best
 

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Yeah, if you're spraying "alot" or more the primary length isn't so important, just make sure you get lots of nawz stickers and you'll be golden.
 

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Equal length headers should give the best performance. I makes it more difficult to build, so many people ignore the optimum dimensions and just build them so they fit the easiest. I think it depends on how much of a purist you are as well as the skill set. I know several of the higher end header guys use the PipeMax program to get the dimensions. Stepped header tubes also increase performance.
http://www.maxracesoftware.com/pipemax36xp2.htm
 
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