# 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".

### Algorithm:

The following equation was used in the above calculation:
BestHeader = (CID * 1900)/(rpm_max * tube_od^{2})

Bruce Bowling

bbowling@earthlink.net

Bowling Superior