#1---Head Flow Charts & Comparisons

12/23/2015


        There are enough flow numbers on our website to keep everyone busy for a while. The numbers are from our in-house flow bench. We now have a SAENZ model 680 flow bench which we all enjoy using. It has all the bells and whistles and even gives us information that we didn't even ask for. It automatically corrects for atmospheric conditions. It is cool! All tests were done at 28".  

Now your next question is........
What will they flow on my bench?
The answer is that we don't know. That is why we supply these before and after charts and again, all flow benches do not flow the same! Benches can show a difference of about 3to 5%.
5% at 300CFM is a difference of 15CFM. We have seen benches off 6 to 8 %.
8% at 300CFM is 24CFM. An extra 24CFM will really help a guy sell heads! How does this make you feel? I know, you feel cheated, so do we, but this is what we have to deal with in this business.
  So how do you go about determining a good port? After 30 years of flowing heads the industry still does not have a good answer to this. Here are some indicators to help.

  1. Know this for sure. If most legitimate shops are getting 350CFM airflow out of a certain head and someone suddenly starts advertising 390CFM...... that is just what it is, advertising (or a mis-used flow bench)

  2. Clue to a good port. The flow should rise very quickly. For example: Lets take a head that flows a maximum of 300CFM. The  lower the lift at which that number is reached, the better the port design. If maximum flow is reached at .500" lift the head will produce a better power curve than if the valve must be opened to .700" lift or more to get the flow.  A head that flows good quickly is what we call our "Fat Flow" ports.

  3. If the flow continues to increase a lot above your maximum lift the port volume is too big and the port is poorly designed and will therefore have a lower velocity and poor power output.

 4. The port with the most flow quickly reached is the best designed port.  The port volume is very dependent on the application, displacement, cam etc.... As the displacement and RPM rise, the port volume will need , generally, to increase as well. As a point of interest.... it is almost impossible to make a port to big on a Mopar wedge engine.

 5. The flow numbers above about 96% of your net lift do a lot more for your ego than they do for your power curve......But, they look good in ads.

 6. Flow numbers by themselves are a poor way to judge a head. Important power producing features like velocity and wet flow cannot be seen in flow numbers. Our SAENZ flowbench will show average airflow over a specific lift range similar to the average horsepower and torque shown on an engine dyno test sheet. After looking at flow averages within the lift of the cam that will be used, it becomes apparant that this can be a very handy tool for choosing cylinder heads. Going a step further, if you look at the average flow from about .150" lift to .050" less than max lift. this is the most important lift areas related to power production. This average flow versus the original average at the same lift area gives a very graphic answer to how the porting will actually benefit your engine. So, expect to see average flow results along with the standard flow numbers.

 7. Keep in mind that we are constantly working on head development and these numbers can change. We spend part of every week doing R&D on head porting and design all year long.   

 
 8. The charts below show the difference between stock flow numbers as well as the flow after our modifications are made. But there can be probelms here too. For example, we have seen as much as 15-20 cfm difference in stock heads that have the same part numbers. So, our "stock flow" is an example of stock flow. The actual gain in flow is much more important than what the flow "number" is. 
 
  9. Cross-sectional Area: The cross-sectional area has to do with how much the port shape and size changes from the gasket surface to the short turn in the intake port (for the most part). You want as little change in cross-section as possible. When the port walls diviate from a straight path due to pushrod, head bolt etc... location, this effects the flow and fuel atomization in a negative way. You can't tell this with flow numbers but an eyeball check comparing several differant ports will give you a good idea of what to look for.
 
10.  C.N.C Super Prepped Heads have a propietary valve job, deep bowl blending and a deep port match at the port mouth. These modifications will increase airflow up to .450"-.500" lift. To gain flow above that point, the entire port will need to be reworked (which will in turn help the low and mid-lift flow number too. Note the flow on our fully CNC ported heads). Some heads do not respond to our C.N.C. machined chambers so we do not offer them.  Examples of this are the 84 & 88cc chamber big block Edelbrock heads.
    
11.   CNC Ported Heads.  These heads are fully CNC ported and have our priority racing valve job.  In some cases, we may offer 2 different CNC ported versions such as our Stage 3 ported LA or magnum Edelbrock heads.  In cases like this, one is a special such as the offset pushrod large port version, and the other is a fully CNC'd head without the offset pushrod.  The one with the offset pushrod  will make more power.

12.  Iron Heads.  e currently offer C.N.C. Super Prepped versions of of the EQ Iron Ram and INDY "X" heads
 

You may notice as you wander around our website that from time to time there may be flow charts of the same head on two different pages. The "Stock" flow numbers may not be exactly the same on each page. This is not a mistake. We actually do the stock flow test on the head that we are going to port. Stock flow numbers routinely vary from head to head and port to port so it is inevitable that the numbers will vary a little.
 
Note: These are average numbers.
Stock ports can vary by +/- 8 cfm in the same head.

 


 Aluminum Heads(Iron heads at bottom of page)
 
 
Small Block Edelbrock RPM "LA" Heads 
                   Edelbrock 60775 & 60779
 
 
                                                                                                                                                    
                                          SMALL BLOCK EDELBROCK RPM "LA" HEADS

                                INTAKE FLOW  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                  EXHAUST FLOW
  Up to 417HP
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Up to 540HP  
 
 
 
 
 
 
 
 
 
 
 
 
 
 Up to 650HP  
 
 
 
 
 
 
 
 
 
 
 
 
 
 Up to 725HP         
 
 
 
 
 
 
 
 
 
 
 
 
 
  
Lift Stock  CNC Super Prep 
CFM Gain Full CNC 
CFM  Gain Big Mouth CNC 
CFM Gain Stock CNC Super Prep 
CFM Gain

 Full CNC & BigMouth

CFM Gain
.100 67.6 72.1 4.5
72.0 4.4 77.4 9.8  84.4 87.8  3.4  89.0  1.3
.200 128.0 150.4 22.4
149.0 21 168.1 40.1  129.8  136.5  6.7  139.2  2.7
.300 185.2 209.5 24.3 221.0 35.8 236.4 51.2  142.6  153.0  10.4  156.0  13.4
.350 208.1 231.3 23.2 245.0 36.9 262.1 54.0  151.2  169.1  17.9  173.0  21.8
.400 227.1 248.5 21.4 266.0 38.9 279.0 51.9  157.2  178.4  21.2  185.0  27.8
.450 240.4 257.0

16.6

285.0 44.6 292.4 52.0  161.3  184.2  22.9  197.0  35.7
.500 253.7 257.0 3.3 296.0 42.3 304.8 51.1  163.3  186.6  23.3  206.0  42.7
.550 256.4 257.3 0.9 301.0 44.6 308.4 52.0  164.2  188.7  24.5  214.0  49.8
.600 253.6 257.9 4.3 303.0 49.4 312.3 58.7  164.9  189.8  25.0  218.0  53.1
.650 251.7 252.1 0.4 304.0 52.3 316.2 64.5  164.4  190.1  25.7  223.0  58.6
.700 254.0 -  - 305.0 51 319.9 65.9  165.0  191.7  26.7  226.0  61.0
.750 259.0  -  - 305.0 46 321.4 62.4      -     -     -  228.0   -
                                                               BigMouth Port Vol 225cc
 
  

    

Small Block Edelbrock Victor Head

 Lift  Intake  Exhaust
 .050  39.3  29.7
 .100  75.8  57.4
 .150  116.1  84.8
 .200  167.4  115.5
 .250  207.6  134.5
 .300  238.5  154.1
 .350  267.5  170.9
 .400  296.2  187.0
 .450  320.9  201.7
 .500  339.3  212.3
 .550  348.5  221.4
 .600  357.3  227.7
 .650  362.4  233.6
 .700   366.7  238.6
 .750  371.1  243.1
 .800  371.3  246.7





Small Block Edelbrock RPM Magnum Heads 
            Edelbrock 61775 & 61779



                     Small Block Edelbrock RPM "Magnum" Heads

                                INTAKE FLOW  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                  EXHAUST FLOW
  Up to 417HP
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Up to 540HP  
 
 
 
 
 
 
 
 
 
 
 
 
 
 Up to 650HP  
 
 
 
 
 
 
 
 
 
 
 
 
 
 Up to 725HP         
 
 
 
 
 
 
 
 
 
 
 
 
 
  
Lift Stock  CNC Super Prep 
CFM Gain Full CNC 
CFM  Gain Big Mouth CNC 
CFM Gain Stock CNC Super Prep 
CFM Gain

 Full CNC & BigMouth

CFM Gain
.100 71 73 2 72 1 73 2 55 58 3 70 15
.200 138 154 16 149 11 150 12 113 120 7 123 10
.300 188 212 24 221 33 227 39 150 152 2 156 6
.350 213 235 22 245 23 258 45 162 168 6 173 11
.400 230 249 19 266 17 282 74 176 182 6 185 9
.450 236 257 21 285 28 304 68 185 193 8 197 12
.500 240 262 22 296 34 314 74 189 200 11 206 17
.550 249 263 15 301 38 324 75 195 204 9 214 19
.600 251 263 14 303 40 327 76 196 207 11 218 22
.650 250 263 13 304 41 331 81 197 212 15 223 26
.700 254 263 9 305 42 334 80 198 213 18 226 22

                                                BigMouth Port Vol 225cc                                                                                              


 
Indy T/A Heads. Edelbrock Small block "LA" with intake pushrod moved over .190"

                     Intake Flow              Exhaust Flow
Lift Stock   Fully CNC Ported CFM Gain   Stock   Fully CNC Ported Gain
.100 65   74 9   84   96 2
.200 127   162 36   129   133 4
.300 182   226 45   143   156 14
.350 208   249 41   151   173 22
.400 233   270 36   157   185 28
.450 253   288 35   161   197 36
.500 253   292 39   163   206 43
.550 252   299 46   169   214 50
.600 254   305 50   165   218 54
.650 254   306 52   164   223 59
.700 256   308 52   165   226 57

 




GEN 3 Hemi Heads
 


5.7 Hemi Airflow @ 28”


Flow tests below show results from our SAENZ 680 Flow Bench

Lift

Stock
Intake

CNC'd Intake Gain

Stock
Exhaust

CNC'd Exhaust Gain
.100 69 81 +12   74  
.200 150 164 +14 112 113 +1
.300 215 236 +21 144 156 +12
.350 239 264 +25 151 180 +29
.400 251 289 +38 160 199 +39
.450 259 308 +49 163 218 +45
.500 261 325 +64 164 232 +68
.550 261 335 +74 164 241 +77
.600 263 342 +79 165 249 +84
.650 264 347 +83 166 253 +88
 
valves (2.100” int, 1.575” exh) 5.7 Heads
85.4cc comb chambers
As you can see, these are extreme flow heads. We have used them on a 740 HP, 392" engine running pump gas.
 

 

      


 Big Block Edelbrock RPM Heads 
  Edelbrock 60929, 60829, 5093

 

 

                         Big Block Edelbrock RPM & E-Street 84cc Heads

                           Intake Flow                   Exhaust Flow
  Up to 550HP   Up to 627HP     Up to 725HP              
Lift Stock Prepped CFM Gain Full CNC CFM Gain Stock Prepped CFM Gain Full CNC CFM Gain
.100 74 75 1 80 0 69 78 9 80 10
.200 147 152 6 162 16 129 134 5 139 15
.300 209 225 14 229 20 165 172 7 176 11
.350 230 239 12 254 24 175 183 8 190 15
.400 247 265 18 281 34 184 195 9 204 20
.450 256 276 20 294 38 196 205 8 222 18
.500 268 284 16 308 40 207 219 12 236 17
.550 281 286 4 319 38 213 227 14 245 17
.600 275 286 4 328 53 220 237 16 252 15
.650 280 286 5 330 50 222 239 16 255 17
.700 280 286 5 333 53 222 239 17 261 21

 

 


                            Big Block Edelbrock RPM & E-Street 75cc Heads

                           Intake Flow                   Exhaust Flow
  Up to 550HP   Up to 627HP     Up to 725HP              
Lift Stock CNC Super Prepped CFM Gain Full CNC CFM Gain Stock CNC Super Prepped CFM Gain Full CNC CFM Gain
.100 67 77 10 84 17 69 78 9 79 10
.200 125 154 29 170 45 129 134 5 138 9
.300 188 219 31 237 49 165 172 7 176 11
.350 219 246 27 264 45 176 183 8 190 15
.400 238 265 27 287 49 184 195 9 208 24
.450 262 279 17 299 37 196 205 8 222 18
.500 272 289 17 316 44 207 210 12 233 14
.550 275 298 23 327 52 214 227 14 243 16
.600 280 304 24 339 56 220 237 16 249 13
.650 286 305 19 340 59 221 238 16 255 17
.700 291 305 14 344 53 222 239 17 260 20
                 


             Big Block Edelbrock Victor Heads
             Standard 440 Size Intake Ports 
            Hughes 4656 / Edelbrock 77929
  
          


 
                   Edelbrock Big Block Victor (440 Port Size) 
                             Super Prepped (Hand Work)
                                         # HUG4656-P
    
                      
    


                 Edelbrock Big Block Victor (440 Port Size) 
         
      C.N.C.Super Prepped (C.N.C. & Hand Work)
                                    # HUG77929-SCP
   
 
 

Flow tests below show results from our SAENZ 680 Flow Bench
Lift Stock Intake CFM CNC'd Intake CFM CFM Gained Stock  Exhaust CFM CNC Super Prep Exhaust CFM CFM Gained
.100 74.4 75.1 0.7 63.7 79.1 15.4
.200

137.0

162.9 25.9 115.2 130.8 15.6
.300 191.7 220.8
29.1
167.4 185.3 17.9
.350 220.1 254.5 34.4 192.5 205.8 13.3
.400 247.8 284.7 36.9 212.5 220.1 7.6
.450  273.9 308.4 34.5 226.6 229.4 2.8
.500 293.8 328.8 35.0 234.6 236.4 1.8
.550 309.5 342.7 33.2 238.3 240.4 2.1
.600 310.7 344.4 33.7 241.8 241.9 .1
.650 311.0 339.4 28.4 243.9 244.1 .2
.700 316.4 340.7 24.3 244.9 246.1 1.2
.750       246.0 245.7 .3
.800       246.7 246.3 -
























        

   

 

                        
  


                           Edelbrock Big Block Victor (440 Port Size) 
                                      Fully C.N.C. Ported
                                         # HUG77929-S3
 
                         

Port Volume: INT 313cc EXH 84cc

Flow tests below show results from our SAENZ 680 Flow Bench
Lift Stock Intake CFM CNC'd Intake CFM CFM Gained Stock  Exhaust CFM CNC'd Exhaust CFM CFM Gained
.100 74.4 81.2 6.8 63.7 77.9
14.2
.200

137.0

170.9 33.9 115.2 129.5 14.3
.300 191.7 235.1 43.4 167.4 183.8 16.4
.350 220.1 267.8 47.7 192.5 208.2 15.7
.400 247.8 290.4 42.6 212.5 234.7 22.2
.450 273.9 313.0 39.1 226.6 256.6 30
.500 293.8 320.3 26.5 234.6 273.8 39.2
.550 309.5 331.9 22.4 238.3 287.1 48.8
.600 310.7 342.0 31.3 241.8 296.4 54.6
.650 311.0 349.6 38.6 243.9 305.4 61.5
.700 316.4 354.7 38.3 244.9 312.4 67.5
.750 318.6 356.3 37.7 246.0 317.7 71.7
.800       246.7 322.4 75.7
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

 

 

 

 

 

 

 

 
 
          Big Block Edelbrock Victor Heads
             Max Wedge Size Intake Ports 
            Hughes 4658 / Edelbrock 77949
 
                 Edelbrock Big Block Victor (Max WedgePort Size) 
                      
       Super Prepped (Hand Work)
                                         # HUG4658-P
                                   


             Edelbrock Big Block Victor (Max WedgePort Size) 
                  
 C.N.C.Super Prepped (C.N.C. & Hand Work)
                                      # HUG4658-SCP
                                   
 

 

                    Edelbrock Big Block Victor 
                   (Monster (Max) Wedge Port Size) 
                             Fully C.N.C. Ported 
                         
          # HUG77949-S3 

                  355cc int port vol
Flow tests below show results from our SAENZ 680 Flow Bench

Lift Stock Intake CFM CNC'd Intake CFM CFM Gained Stock Exhaust CFM CNC'd Exhaust CFM CFM Gained
.100 74.4 79 5 63.7
77.9
 14.2
.200

137.0

164 30 115.2 129.5 14.3
.300 191.7 245 43.3 167.4 183.8 16.4
.350 220.1 270 47.9 192.5 208.2 15.7
.400 247.8 300 45.2 212.5 234.7 22.2
.450 273.9 328 43.1 226.6 256.6 30
.500 293.8 351 53.2 234.6 273.8 39.2
.550 309.5 366 45.5 238.3 287.1 48.8
.600 310.7 380 65.3 241.8 296.4 54.6
.650 311.0 391 73.0 243.9 305.4 61.5
.700 316.4 397 79.6 244.9 312.4 67.5
.750 318.6 397 60.4 246.0 317.7 71.7
.800 322.0 406 86 246.7 322.4 75.7

 

  

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 



 

 


Edelbrock Victor Jr. CNC Cylinder Heads For Chrysler HEMI®
                  Super Prepped
Combustion Chamber volume 170cc
Intake runner volume 245cc
Exhaust runner volume 105cc
Intake valve diameter 2.32"
Exhaust valve diameter 1.94"

Flow tests below show results from our SAENZ 680 Flow Bench with a pipe.
Lift Intake
Stock
Int Super Prepped   Exhaust Stock Exh Super Prepped
.050 40.4 52.3 (+12)   35.7 35.3
.100 76.8 87.7 (+11)   70.0 72.9 (+3)
.150 111.5 128.2 (+17)   110.8 117.0 (+6)
.200 148.7 168.9 (+20)   151.2 151.0
.250 188.1 213.4 (+25)   179.2 181.0 (+1)
.300 226.7 258.5 (+32)   207.3 202.8 (-5)
.350 265.0 298.2 (+33)   229.5 223.8 (-6)
.400 303.9 338.2 (+35)   249.8 246.9 (-3)
.450 340.9 372.4 (+32)   266.4 269.7 (+3)
.500 372.6 399.0 (+27)   279.9 291.4 (+12)
.550 398.9 420.1 (+22)   286.6 307.5 (+21)
.600 413.8 433.0 (+20)   290.0 320.0 (+30)
.650 421.8 439.2 (+18)   290.5 328.8 (+38)
.700 429.9 442.8 (+13)   291.3 333.5 (+41)
 .750   443.7      
.800   446.4      
Average        209.9 234.6
 
   INDY Cylinder Heads 440 EZ
(Standard 440 Intake Port Size)
   HUG4950/ IND440-H1-SEZ-1
 

  


INDY Big Block440-EZ (Standard 440 Port Size) 
            
CNC Super Prepped
 
Flow tests below show results from our SAENZ 680 Flow Bench                 

 

Test Stock Indy Intake Port Intake Port with CNC Super Prep CFM Gained      Stock Indy Exhaust Port Exhaust Port with CNC Super Prep CFM Gained
.100 74.4 80.7 +6.3   59.7 70.4 +10.7
.150 106.6 120.4 +13.5   79.1 96.6 +17.5
.200 136.7 154.0 +17.3   97.5 117.4 +19.9
.250 168.9 186.8 +17.9   116.0 136.8 +20.8
.300 196.5 218.1 +21.6   134.0 153.9 +19.6
.350 223.4 248.5 +25.1   152.1 169.6 +17.5
.400 247.9 274.9 +27.0   167.9 183.0 +15.1
.450 267.1 295.1 +28.0   182.9 196.0 +13.1
.500 284.1 313.6 +29.5   196.3 207.1 +10.8
.550 295.6 322.6 +27.0   205.5 215.4 +19.9
.600 295.9 332.1 +36.0   215.0 221.7 +6.7
.650
 298.8  332.9  +34.1    219.6  227.1  +7.5
.700 304.4 336.3 +31.9   223.5 230.7 +7.2
AVG 210.1 232.7     148.8 161.7  

The CNC Super prepped heads have our filled intake ports (CLICK HERE to learn more), a racing valve job and CNC'd combustion chambers. The chamber finishes at about 80cc and we can mill them back to any size you need.


   INDY Cylinder Heads 440 EZ
  (Max Wedge Intake Port Size)
             HUG4950MW

  

       INDY Big Block440-EZ (Max Wedge Port Size) 
               
 
Fully CNC Ported
               # HUG 4950-MW-S3
          Use the chart below to view flow numbers.              

    Flow Comparisons Between the
 INDY EZ-295 vs. Hughes C.N.C's INDY EZ's 

This chart is to show the difference in INDY EZ MaxWedge CNC vs. Hughes Max Wedge CNC on the same head. 

Flow tests below show results from our SAENZ 680 Flow Bench
 
 Intake Port Volumes          Exhaust Port Volumes
  INDY      Hughes                   INDY        Hughes
   318         298                           81                79
 
 
Test Indy Intake Hughes Intake Gain in CFM   Indy Exhaust Hughes Exhaust Gain in CFM
.100" 72 77 +5        
.200" 146 159 +12   91 88 -3
.300" 215 231 +16   136 135 -1
.350" 247 264 +17   155 155 0
.400" 276 283 +7   174 177 +3
.450" 297 304 +7   191 197 +6
.500" 315 323 +8   203 218 +15
.550" 331 339 +7   218 230 +12
.600" 341 345 +4   227 241 +14
.650" 349 352 +3   235 248 +13
.700" 351 352 +1   241 252 +11
 
 

 Iron Heads

 
 
 
 INDY "X" Head & Iron Ram (EQ)
Small Block "LA" & Magnum Style


 

    

          RHS   "X" Heads & Iron Ram (EQ) CNC Super Prepped
  (LA & Magnum heads use the same ports)

Flow tests below show results from our SAENZ 680 Flow Bench

Lift Stock 1.92" int valve CNC Prepped
2.055" int valve
CFM Gained
.100" 63 72.8
+10
.200" 128 147.6 +19
.300" 182 213.7 +31
.350" 201 239.3 +38
.400" 216 258.2 +42
.450" 232 273.0 +51
.500" 246 282.0 +36

 Note: These are average numbers.
Stock ports can vary by +/- 6 cfm in the same head.

------------------------------------------------------------------------------------------------------------------          

 

 

EQ Iron Ram Stealth Ported Heads (2.02" intake valves)
 

Lift Stock Int 1.92" valves Stealth ported Int 2.02" valves CFM Change   Stock Exh 1.62" Valve Stealth Ported Exh 1.62" CFM Change
.100 69.5 68.4 -1.1   56.7 62.3 +5.6
.200 118.9 140.4 +21.5   110.2 124.6 +14.6
.300 164.2 205.1 +40.9   156.7 176.0 +19.3
.350 191.2 230.1 +38.9   176.7 191.8 +15.1
.400 219.3 251.5 +32.2   192.3 200.7 +8.4
.450 238.7 268.7 +30.0   202.5 205.0 +2.5
.500 252.6 277.4 +24.8   211.2 208.1 -3.1
               

  

  Big Block OEM Iron Heads

 

 

     Big Block Iron '452 
    Stage 3 Fully Ported
Flow tests below show results from our SAENZ 680 Flow Bench   

Lift Ported Intake cfm   Ported Exhaust cfm
.100 75.8    
.200 155.0   76.4
.300 213.9   125.4
.350 227.3   142.9
.400 243.4   162.3
.450 258.4   177.4
.500 269.4   190.3
.550 278.5   199.8
.600 286.0   205.9
.650 289.4   211.1
.700 291.3   211.1

 
 
 
 
  
 
Undercover "Stealth" Porting
Small Block "LA" Iron Heads
 

         Stealth-ported" S/B Oval Track Heads
      '596 casting number OEM valves 1.88-1.60
              Stealth Valves 2.02-1.60

Flow tests below show results from our SAENZ 680 Flow Bench
 

 

OEM Stealth CFM   OEM Stealth CFM
  INT INT Change      Exh Exh Change
.100" 66 71 +5   51 80 +29
.200" 89 144 +55   103 124 +21
.300"   136 192 +56   131 149 +18
.350"   176 211 +35   136 156 +20
.400" 184 226 +42   140 160 +20
.450" 186 231 +45   142 168 +26
.500" 184 223 +39   141 168 +27
.550" 183 218 +35   142 168 +26

 Note: These flow figures are representative of improvements
 that can be made with stealth porting on LA heads.
Actual flow will vary with different casting numbers.

 

 

 

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