yes , 2-Step Headers with 2.000" OD and 2.125" OD will still work with your Engineby 408 Nova » Tue Dec 29, 2020 4:15 pm
are 2"-2.125" stepped primaries what I need for the engine listed?
making its Peak HP at 8500 RPM , and will still be beneficial to 9000 RPM
.... these Specs are for Peak HP occuring at 8500 RPM :
Calculated Exhaust Port Flow @28in.= 280.0000 -to- 299.8402 CFM @ 0.904300 Lift (no Flow Pipe)
User's Exhaust Port Flow input @28in.= 280.0000 CFM @ 0.940000 Valve Lift (no Flow Pipe)
Engine Application = Professional Race Engine • Hi RPM Peak TQ • Hi RPM Peak HP
Exhaust Header Type = --- Primary Tube Specs : Race Header • Multiple Steps ---
--- 2-Step Primary Pipe Specs --- ( Total Length= 24.962 to 27.329 inches )
1st Step Diameter inches= 2.000 Length= 12.481 to 13.664 inches
2nd Step Diameter inches= 2.125 Length= 12.481 to 13.664 inches
--- 2-Step Primary Pipe Specs --- ( possibly higher RPM HP )
1st Step Diameter inches= 2.000 Length= 6.241 to 6.832 inches
2nd Step Diameter inches= 2.125 Length= 18.722 to 20.497 inches
--- 3-Step Primary Pipe Specs --- ( possibly higher RPM HP than 2-Step Headers )
1st Step Diameter inches= 2.000 Length= 12.481 to 13.664 inches
2nd Step Diameter inches= 2.125 Length= 6.241 to 6.832 inches
3rd Step Diameter inches= 2.250 Length= 6.241 to 6.832 inches
------------------------------------------------------------------------------------------------------
--- Collector Specs : Straight Tube Collector • or Straight with a more Merge shape ---
Peak TQ Diameter Range = 3.681 -to- 3.806 Best Length= 13.000 -or- 26.001 inches
Best Mid-Range Diameter = 3.806 Best Length= 13.000 -or- 26.001 inches
Peak HP Diameter Range = 3.806 -to- 3.931 Best Length= 13.000 -or- 6.500 inches