Exhaust Header Tube Length Computation
By Bowling
The following "empirically" determines the best header length to use for a given tube outside diameter, CID, and maximum engine RPM. The equation I am using is from the company "Hedders by Ed" and I do not know if this applies to differing cylinder configurations (I am assuming 8 cylinders, 4-to-1 collector), and if this is for open headers or a free-flowing downstream exhaust. However, the calculation is still interesting, and may help you get into the "ballpark".
The following equation was used in the above calculation:
BestHeader = (CID * 1900.)/(rpm_max * tube_od**2)
Many Thanks to Mr. Bruce Bowling
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