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Re: big block chevy headers?
If you are refering to the L92 heads, I still don't think they need 2" primaries. Yes the heads don't have good I/E flow ratio and that is why it's best to use a decent size split cam, but you should not need 2" primaries.
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------Motor---------------Bottle
60'---1.53---------------1.41
1/8---6.58 @ 105.92----5.87 @ 118.41
1/4---10.38 @ 126.97----9.24 @ 142.49
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