Calculated Exhaust Port Flow @28in.= 237.0000 -to- 253.7933 CFM @ 0.412293 Lift (no Flow Pipe) User's Exhaust Port Flow input @28in.= 237.0000 CFM @ 0.501000 Valve Lift (no Flow Pipe) Engine Application = Race Engine • Mid-Range Peak TQ • Hi RPM Peak HP --- Primary Tube Specs : Tri-Y Race Header • Multiple Steps --- --- 2-Step Tri-Y Headers --- Primary Y Segment 1st Step Diameter = 1.972 Length= 11.136 to 11.490 inches Secondary Y Segment 2nd Step Diameter = 2.159 Length= 11.136 to 11.490 inches Primary + Secondary Segment's Total Best Length = 22.273 -to- 22.980 inches --- 3-Step Tri-Y Headers --- ( possibly higher RPM HP than 2-Step Headers ) Primary Y Segment 1st Step Diameter = 1.909 Length= 7.424 to 7.659 inches Primary Y Segment 2nd Step Diameter = 2.034 Length= 7.424 to 7.659 inches Secondary Y Segment 3rd Step Diameter = 2.284 Length= 7.424 to 7.659 inches Primary + Secondary Segment's Total Best Length = 22.273 -to- 22.980 inches --- 4-Step Tri-Y Headers --- ( possibly higher RPM HP than 3-Step Headers ) Primary Y Segment 1st Step Diameter = 1.784 Length= 5.568 to 5.745 inches Primary Y Segment 2nd Step Diameter = 1.909 Length= 5.568 to 5.745 inches Secondary Y Segment 3rd Step Diameter = 2.034 Length= 5.568 to 5.745 inches Secondary Y Segment 4th Step Diameter = 2.409 Length= 5.568 to 5.745 inches Primary + Secondary Segment's Total Best Length = 22.273 -to- 22.980 inches --- Primary Tube Harmonics --- ( One-End-Closed Tube = Odd Numbered Harmonics ) 1st Harmonic = 72.819 to 73.526 inches long ... typically never used ( too long to fit any Vehicle ) 3rd Harmonic = 22.273 to 22.980 inches long ... highly recommended , best Torque and HP Curve 5th Harmonic = 12.164 to 12.871 inches long ... shortest recommended ( Shorty or very Hi-RPM Header ) 7th Harmonic = 7.831 to 8.539 inches long ... shortest recommended ( Shorty, Hugger, or Log Style ) 9th Harmonic = 5.424 to 6.132 inches long ... shortest recommended ( Log Style or Cast-Manifold ) 11th Harmonic = 3.893 to 4.600 inches long ... shortest recommended ( Log Style or Cast-Manifold ) ------------------------------------------------------------------------------------------------------ --- Collector Specs : Straight Tube Collector • or Straight with a slight Merge shape --- Peak TQ Diameter Range = 4.178 -to- 4.303 Best Length= 14.950 -or- 29.900 inches Best Mid-Range Diameter = 4.303 Best Length= 14.950 -or- 29.900 inches Peak HP Diameter Range = 4.303 -to- 4.428 Best Length= 14.950 -or- 7.475 inches --- Collector's Harmonics --- ( Both-Ends-Open Tube = Odd and Even Numbered Harmonics ) 1st Harmonic = 119.602 inches long ... longest recommended with Mufflers and TailPipes 2nd Harmonic = 59.801 inches long ... longest recommended with Mufflers and TailPipes 3rd Harmonic = 29.900 inches long ... greater Low RPM Torque -to- Peak Torque RPM 4th Harmonic = 14.950 inches long ... highly recommended , best Torque and HP Curve combination 5th Harmonic = 7.475 inches long ... reduced Peak Torque , higher RPM HP gains possible 6th Harmonic = 3.738 inches long ... reduced Low RPM Torque , even though Tuned Length Best TQ + HP Tuned Collector Lengths= 3.738, 7.475, 14.950, 29.900, 59.801, 119.602 inches long Worst TQ + HP Loss Collector Lengths= 5.606, 11.213, 22.425, 44.851, 89.701, 179.403 inches long Collector definition: from the Primary Tube's ending inside the Collector -to- Atmospheric exit point Note : all Tube Outside Diameters are based-off your Header Tube Thickness choice's value ------------------------------------------------------------------------------------------------------ Bore=3.44500 Stroke=3.58300 200.38554607 Cubic Inches @ 7960 RPM Intake System= 137.91320 VE% Complete Intake System Flow @28in.= 282.8975 -to- 302.9429 CFM @ 0.512000 Lift (2.00000 VE% Loss) Cylinder Head Intake Port Flow @28in.= 287.0000 -to- 307.3362 CFM @ 0.512000 Lift (139.91320 VE%) Cylinder Head's Exhaust Port CenterLine Length = 3.0000 inches Target EGT= 1139.1 degrees F or 615.1 degrees C at end of 4 second 600 RPM/Sec Dyno accel. test EGT Probe location = 0.750 to 1.000 inch from Header gasket flange at 12:00 O'Clock position EGT Probe tip depth = 0.500 to 0.750 inch depth into Header Primary Tube Speed of Sound = 1960.1 Feet per Second at 1.000 inch distance into Header Primary Tube Header Collector Spear Length = 0.0000 inches Exhaust/Intake Port Flow Ratio = 82.578 % Exhaust System operating RPM Range from 5960 to 8460 RPM Hertz frequency = 66.3 Hz at 7960 RPM ------------------------------------------------------------------------------------------------------ Camshaft = OverHead • Finger - Follower Arm 600 RPM/Sec Dyno Test Level=7 Level=8 Level=9 Level=10 Piston FPM Peak HorsePower @ 7960 RPM 431.6 437.1 442.6 448.2 4753.45 Peak Torque Lbs-Ft @ 6000 RPM 309.1 315.6 319.6 323.6 3583.00 ------------------------------------------------------------------------------------------------------ Fuel BTU=19000.0 Air/Fuel Ratio=13.200000 BSFC=0.492496 Mixture Distribution= 90.0 Quality= 90.0 Dyno HP Weather Correction Equation = 8• SAE J607 (June1974) • STP • SuperFlow-FTQ • (Default) HP Correction Factor= 1.000000000 Fuel Type= Gasoline • Race Gas • HP and Torque increase Station Barometer=29.92000000 Air DegF=60.00 Vapor Pressure=0.000 Air Correction=1.00000000 Station Barometer NOAA=29.92885898 Pressure Altitude Feet= 1.2 Z•Elevation Feet= 0.0 Density Altitude Feet=67.2 Relative Humidity % = 0.00 Dew Point DegF = -263.39 Virtual Temperature DegF = 60.00 Water Grains = 0.00 Wet Bulb DegF = 38.73