[vector1]

this is using the information you gave me using pipemax program. note--these lengths are from valve face to atmosphere. previous figures are from head mounting surface to atmosphere, so they are pretty close numbers it appears. the distance from valve face to intake manifold mounting surface distance is 5". so subtract 5" from the below numbers to tune for a specific harmonic, this would be the length of the throttle body from mounting surface to opening at the bell.

- Induction System Tuned Lengths - ( Cylinder Head Port + Manifold Runner )
1st Harmonic= 39.072 (usually this Length is never used)
2nd Harmonic= 22.176 (some Sprint Engines and Factory OEM's w/Injectors)
3rd Harmonic= 15.482 (ProStock or Comp SheetMetal Intake)
4th Harmonic= 12.186 (Single-plane Intakes , less Torque)
5th Harmonic= 9.887 (Torque is reduced, even though Tuned Length)
6th Harmonic= 8.318 (Torque is reduced, even though Tuned Length)
7th Harmonic= 7.179 (Torque is greatly reduced, even though Tuned Length)
8th Harmonic= 6.314 (Torque is greatly reduced, even though Tuned Length)
Note> 2nd and 3rd Harmonics typically create the most Peak Torque
4th Harmonic is used to package Induction System underneath Hood