Small Block Head Flow Chart

Mopar Racers Forum

  1. TurboGLH

    TurboGLH Well-Known Member

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    I'll add any flow numbers contributed by a member, but I don't want to take info from someone else's website if they haven't given permission. But no reason that people can't link like they have been, and use the info to compare to what we've compiled here.

    h ttps://docs.google.com/spreadsheets/d/15SOi3ZNKQOGbLAcOgtiM_w6snBml-d5M0rKCrNZREpA/edit?usp=sharing

    (remove space and copy/paste to view in it's own window
     
    Last edited: Dec 4, 2019
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    • 70aarcuda

      70aarcuda Master Hoader of SBM FABO Gold Member

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      edelbrock CNC heads by Modern Cylinder Heads...in pdf file
       

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      • PRH

        PRH Well-Known Member

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        RHS/Indy LAX head, 1.92/1.62 valves, @28”, 4.00” bore, no tube on ex, ootb:

        Lift——in/ex
        .100— 66/55
        .200—118/104
        .300—172/145
        .400—217/167
        .500—246/174
        .600—253/176
         
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        • mopowers

          mopowers Well-Known Member

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          • mod5v

            mod5v Well-Known Member

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          • Krooser

            Krooser Reform School Graduate

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            • 67autocross

              67autocross A new iron curtain drawn across the 49th parallel

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              Here is some numbers from some EQ heads that I bought through my local machine shop in Winnipeg. The owner let me come in on a Saturday and do some clean up on the bowls first and then do a bit of porting under his guidance. The valves are long stem LS Chevy 2.02/1.60 that they had on the shelf.
              Basically the heads are similar to IMM EQs. I would like to buy a set of bare aluminum heads in the future and try a more in depth porting job.

              3C55E72B-4612-45A7-8F41-93BDEB0ACA6C.jpeg
               
              Last edited: Dec 11, 2019
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              • flyfish

                flyfish C8H18+N2O = :-D

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                Here are the flow numbers for my Stage II ported Edelbrocks, ported by Ryan Johnson at ShadyDell.

                LIFT--IN/EX
                .100"--63.0/NA
                .200"--137.9/98.2
                .300"--191.6/141.9
                .400"--243.8/171.9
                .450"--262.2/181.5
                .500"--281.3/188.4
                .550"--289.8/193.8
                .600"--292.9/196.6
                .650"--292.9/199.9
                .700"--292.9/202.1
                 
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                • skrews

                  skrews Well-Known Member

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                  Bone stock 308 casting, no pipe on exh.
                  .100......54........45
                  .150......80........70
                  .200.....117.......87
                  .250.....150......108
                  .300.....164......126
                  .350.....183......139
                  .400.....195......150
                  .450.....205......159
                  .500.....207......162
                   
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                  • skrews

                    skrews Well-Known Member

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                    CNC IndyBrocks out of box 2.055 1.6 valves, Indy's exh #s are without a pipe, mine are with a pipe
                    column 1 Indy's advertised #s
                    column 2 actual out of box #s
                    column 3 fixed valve job and better Ferrea valves
                    ----------1----------------2--------------------3
                    .100 72/66..............59/49 ................ 65/49
                    .200 132/113 ......... 123/108 ............ 150/113
                    .300 197/145.......... 180/150 .............204/155
                    .400 248/170 ......... 229/178............. 248/184
                    .500 277/183 ......... 261/194 ............ 280/206
                    .600 302/191.......... 284/208 .............292/215
                    .700 306/197...........284/215............. 287/222
                     
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                    • IQ52

                      IQ52 Well-Known Member

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                      Stock RHS/Indy LAX head 1.94 intake/1.60 exhaust no tube......

                      .100 57/52
                      .200 124/105
                      .300 184/143
                      .400 230/163
                      .500 255/167
                      .600 257/167

                      Ported RHS/Indy LAX head 1.94 intake/1.625 exhaust w/1-3/4" tube......

                      .100 NA/NA
                      .200 144/131
                      .300 191/173
                      .400 234/201
                      .500 264/222
                      .600 280/236
                      .700 283/238
                      462 HP on a big bore 292ci/273

                      Ported RHS/Indy LAX head (8 cylinder avg.) 2.055 intake/1.625 exhaust w/1-3/4" tube......

                      .100 NA/NA
                      .200 145/124
                      .300 206/176
                      .400 253/214
                      .450 275/226
                      .500 290/236
                      .550 301/242
                      .600 303/248
                      .650 297/253
                      With these heads a 360/424 single 4-bbl stroker made 474 LB-FT @ 3,000 rpm, 574 LB-FT @ 5,100 rpm and 629 HP @ 6,400 rpm. Solid roller 258/260 @ .050, .660/.668 w/1.6 rockers, 110 LSA, 107 ICL and 91 octane pump gas from the Stinker Station.
                       
                      Last edited: Dec 18, 2019
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                      • TurboGLH

                        TurboGLH Well-Known Member

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                        SM CNC - Flowed by @PRH

                        Lift—- in/ex
                        .100— 64/49
                        .200—126/95
                        .300—166/132
                        .400—206/163
                        .500—242/179
                        .600—271/187
                        .700—284/190
                         
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                        • PRH

                          PRH Well-Known Member

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                          Screws numbers aren’t really very viewable on my phone, so I tightened up the columns:

                          CNC IndyBrocks out of box 2.055 1.6 valves, Indy's exh #s are without a pipe, mine are with a pipe

                          column 1 Indy's advertised #s
                          column 2 actual out of box #s
                          column 3 fixed valve job and better Ferrea valves

                          Lift——1——————2——————3
                          .100 72/66.........59/49 ..........65/49
                          .200 132/113....123/108.......150/113
                          .300 197/145....180/150.......204/155
                          .400 248/170....229/178.......248/184
                          .500 277/183....261/194.......280/206
                          .600 302/191....284/208.......292/215
                          .700 306/197....284/215.......287/222
                           
                          Last edited: Dec 26, 2019
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                          • SwedishViking

                            SwedishViking Well-Known Member

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                            Flowchart from my Indy LAX heads.
                            I didnt flow them but the guy that owned them before did.

                            received_861562533959827.jpeg
                             
                          • MOPAROFFICIAL

                            MOPAROFFICIAL Well-Known Member

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                            I think its 10" depression.

                            137 cfm @10"let's say..is roughly 233 cfm @28"
                             
                          • SwedishViking

                            SwedishViking Well-Known Member

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                            Yes it is metric here in Sweden
                             
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                            • fez440

                              fez440 Well-Known Member

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                              Small block mopar Performance world aluminum cylinder heads

                              Screenshot_20191226-145027.jpg
                               
                            • TurboGLH

                              TurboGLH Well-Known Member

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                              SM CNC flowed by @PRH

                              Valve job, back cut valve and a blend.

                              Lift——int
                              .100— 67
                              .200—132
                              .300—191
                              .400—232
                              .500—262
                              .600—275
                              .700—281
                               
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                              • MOPAROFFICIAL

                                MOPAROFFICIAL Well-Known Member

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                                Iron #974
                                11/32 nailhead w/undercut stem 1.94/1.60 valves blended in, minor guide trimming.
                                --------Int--------exh
                                .100..64.............
                                .200..128.....103
                                .300..191.....146
                                .400..229.....169
                                .500..241.5..180
                                .550..241.....192
                                .600..240......199
                                 
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                                • MOPAROFFICIAL

                                  MOPAROFFICIAL Well-Known Member

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                                  894 x head.
                                  11/32 2.02/1.60 under cut stem valves
                                  Ported. @28" 4" bore
                                  ----------int-----exh---
                                  .100..68........
                                  .200..131...110
                                  .300..191...137
                                  .400..238...152
                                  .500..262...188
                                  .550..266...190
                                  .600..271...191
                                   
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                                  • 70aarcuda

                                    70aarcuda Master Hoader of SBM FABO Gold Member

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                                    eddy head...2.055 intake 1.60 exhaust...

                                    100 72/55
                                    .200 148/108
                                    .300 204/149
                                    .400 247/181
                                    .500 278/202
                                    .550 285/207
                                    .600 292/210
                                    .650 290/211
                                     
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                                    • 70aarcuda

                                      70aarcuda Master Hoader of SBM FABO Gold Member

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                                      SM 2.055 intake 1.60 exhaust

                                      .100 74/56
                                      .200 150/109
                                      .300 205/150
                                      .400 245/180
                                      .500 272/200
                                      .550 281/205
                                      .600 290/209
                                      .650 289/211
                                       
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                                      • 12swinger

                                        12swinger Well-Known Member

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                                        580C9FE4-9CC4-4F08-AAE2-9FC4B0C7188A.jpeg I wonder? Seems I’ve seen these blowing 340cfm
                                        I haven’t blown any holes yet, so not there.
                                         
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                                        • TurboGLH

                                          TurboGLH Well-Known Member

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                                          Did you do any chamber work to go along with those larger valves?
                                           
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                                          • SwedishViking

                                            SwedishViking Well-Known Member

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                                            W5?
                                             
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