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Calculate Primary Header Tube Length and Diameter




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These formulas are from A. Graham Bell’s Performance Tuning in Theory and Practice
or Philip A Smith's Scientific Design of Exhaust and Intake Systems.


The following calculator can be used to calculate the header dimensions best suited to your combination. The input terms are below:



Engine speed:
Displacement:
Exhaust Valve Opening (Degrees BBDC):
Ideal Header Parameters: Input you CID, RPM and EVO please