--- Single Primary Pipe Specs --- for 580.216 CID from 5200 to 7700 RPM
Diameter= 2.170 to 2.295 Length= 28.8 to 32.0 inches long
--- 2-Step Primary Pipe Specs ---
1st Dia.= 2.170 Length= 14.4 to 16.0
2nd Dia.= 2.295 Length= 14.4 to 16.0
--- 3-Step Primary Pipe Specs ---
1st Dia.= 2.170 Length= 14.4 to 16.0
2nd Dia.= 2.295 Length= 7.2 to 8.0
3rd Dia.= 2.420 Length= 7.2 to 8.0
--- Header Collector Specs (Conventional Straight Tube) ---
Diameter= 3.930 to 4.180 Tuned Lengths= 15.8 best and also 7.9 or 31.6
--- Header Collector Specs (Megaphone or Diffuser Cone Shape) ---
Diameter= 3.430 taper to 4.430 Megaphone/Diffuser Length= 15.8 inches
Best HP/TQ Tuned Collector Lengths= 15.8 , 31.6 , 63.1 , 126.3 inches long
Worst HP/TQ Loss Collector Lengths= 23.7 , 47.4 , 94.7 , 189.4 inches long
Note-> all Pipe Diameters are OD and based-off .0625 inch Pipe thickness
---- Primary Pipe's Harmonics ----
1st Harmonic = 127.2 inches long ... typically never used
2nd Harmonic = 48.2 inches long ... longest recommended
3rd Harmonic = 28.8 inches long ... highly recommended , best Torque Curve
4th Harmonic = 20.0 inches long ... shortest recommended
5th Harmonic = 15.0 inches long ... typically never used
6th Harmonic = 11.8 inches long ... typically never used
7th Harmonic = 9.5 inches long ... typically never used
8th Harmonic = 7.9 inches long ... typically never used
---- Collector's Harmonics (includes Intermediate, Muffler , TailPipe) ----
1st Harmonic = 126.3 inches long ... longest with Mufflers and TailPipes
2nd Harmonic = 63.1 inches long ... longest recommended with Mufflers
3rd Harmonic = 31.6 inches long ... more bottom-end Torque
4th Harmonic = 15.8 inches long ... highly recommended , best Torque Curve
5th Harmonic = 7.9 inches long ... reduced Torque , more top-end HP sometimes
6th Harmonic = 3.9 inches long ... reduced Torque , not recommended |