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Old 04-01-2013, 06:44 PM
DjohnsonFTW DjohnsonFTW is offline
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SBC header tube diameter

Im sure this question has been asked before, but ill ask anyhow!!

I have a 400 sbc punched out .040'' making it a 408, I am supercharging it to- estimated 6-8 psi.

After the header collector will be 3'' pipe leading to X pipe with 3'' cut outs. after the x it will drop to dual 2.25'' pipes out the rear.

I understand with cutouts closed im limited to the 2.25'' pipe, but will i benefit from larger headers when factoring 3'' cutouts?
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