PONTIAC POWER RULES ! ! !

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.
For a street engine, the RPM used should be the peak torque RPM.
For a race engine, the peak hp RPM should be used.


Engine speed:
Displacement:
Exhaust Valve Opening (in degrees):
Ideal Primary Length and Diameter: Input you CID, RPM and EVO please