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Iron Vs. Aluminum, the Final say!

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  • Iron Vs. Aluminum, the Final say!

    Cliff notes:

    stock 3100 and 3400 heads outflow race ported Iron heads by .350" lift, stock 3500 heads do it by .250" lift the data doesn't lie, and it's from multiple sources.


    Race Ported "falconer" 2.8/3.4 heads:

    Code:
    Lift      #1 Int    #2 Int
    0.100     58.7      58.0
    0.200     110.5     110.8
    0.300     135.7     138.6
    0.400     145.0     142.1
    0.500     149.5     151.0
    0.600     151.0     152.5
    
    Lift      #1 Exh    #2 Exh
    0.100     56.9      58.4
    0.200     101.9     100.2
    0.300     140.0     138.2
    0.400     149.0     152.1
    0.500     152.2     153.6
    0.600     153.7     153.6
    source:
    http://www.thirdgen.org/tec...s-falconer-race.html

    My 3500 heads.



    more flow data here for 3100 and 3400 heads

    http://wot-tech.com/shop/gm...ervices/cat_140.html
    "I am not what you so glibly call to be a civilized man. I have broken with society for reasons which I alone am able to appreciate. I am therefore not subject to it's stupid laws, and I ask you to never allude to them in my presence again."

  • #2
    What stage porting are those 3500 heads?
    Last edited by ga2001532; 02-10-2013, 01:14 PM.

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    • #3
      Originally posted by ga2001532 View Post
      What stage porting are those 3500 heads?
      Keep in mind, column 1+2 are stock, 3+4 are ported, and those numbers are the average of 6 ports. for each value.

      Flow bench ported, but not by Ben/WOT tech. I told my porter to get me the best numbers he could muster.
      "I am not what you so glibly call to be a civilized man. I have broken with society for reasons which I alone am able to appreciate. I am therefore not subject to it's stupid laws, and I ask you to never allude to them in my presence again."

      Comment


      • #4
        3*00 heads outflow SBC heads. The deal with gm recommending them was they can take " duty" better. My guess is overheating, or heat expansion rate. Either way were not dessert racing. Did you cc the chambers curious what they are.
        Anyone know if the 3900 heads cc the same?
        88 Beretta GTU turbo . 90 Black ASC/McLaren TGP, awaiting 4t80. 2003 Grand AM se 3400/4t45 daily grind.

        Comment


        • #5
          They'd really need to be measured on the same bench to be completely scientific, pretty neat how the irons are so even on both sides though. That justifies the old single pattern cams a bit more.
          Past Builds;
          1991 Z24, 3500/5 Spd. 275WHP/259WTQ 13.07@108 MPH
          1989 Camaro RS, ITB-3500/700R4. 263WHP/263WTQ 13.52@99.2 MPH
          Current Project;
          1972 Nova 12.73@105.7 MPH

          Comment


          • #6
            Apples to oranges. I have the luxury of owning a bench, and being able to test different heads on this same bench. Thats the only way to compare anything. Its like telling me milzy gets 290 cfm out of a 3400, or you got 250 out of a 3500. None of that will happen on my bench.
            Ben
            60DegreeV6.com
            WOT-Tech.com

            Comment


            • #7
              Originally posted by SappySE107 View Post
              Apples to oranges. I have the luxury of owning a bench, and being able to test different heads on this same bench. Thats the only way to compare anything. Its like telling me milzy gets 290 cfm out of a 3400, or you got 250 out of a 3500. None of that will happen on my bench.
              how much $$ to make it happen then.

              Dave you have a bench too right?

              I've got a set of L44 Fiero heads I will donate to the Cause also, and I should be able to get a set of Gen 2 castings front he J/Y.

              I would love to see a side by side same bench comparison between the different heads. just stock flow numbers would be good enough for me.


              I am serious.
              Last edited by ericjon262; 02-10-2013, 10:20 PM. Reason: I am serious.
              "I am not what you so glibly call to be a civilized man. I have broken with society for reasons which I alone am able to appreciate. I am therefore not subject to it's stupid laws, and I ask you to never allude to them in my presence again."

              Comment


              • #8
                It really does not matter because iron heads are only used when cost is the major factor in the equation for RWD applications. I would have used aluminum 3500 heads all day long if I had the time and funds to make it happen. But I need my truck back on the road because it was consuming coolant at an alarming rate.

                If you have a FWD car then 3X00 heads are a given. There is no point in comparing iron heads because your never going to go backwards.
                1993 EXT. CAB, 3.4L V6 TBI, 5spd manual. Sonoma
                1990 4Door, 3.2L V6 TBI, 5spd manual. 4X4. Trooper
                Because... I am, CANADIAN

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                • #9
                  I guess it matters the most for Fiero guys, who seem to like putting iron heads on aluminum head blocks. Which makes no sense to me.
                  '89 Firebird, 3500 Turbo, T56, 9-bolt/4.11
                  '86 Fiero, 3500, 4-speed

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                  • #10
                    Originally posted by caffeine View Post
                    i guess it matters the most for fiero guys, who seem to like putting iron heads on aluminum head blocks. Which makes no sense to me.
                    dingdingding!

                    Perfect example:

                    "I am not what you so glibly call to be a civilized man. I have broken with society for reasons which I alone am able to appreciate. I am therefore not subject to it's stupid laws, and I ask you to never allude to them in my presence again."

                    Comment


                    • #11
                      Agreed that is a waste of time since the FWD motor into a Fiero is rather painless. If he is on a budget he should just stick with the old motor.
                      1993 EXT. CAB, 3.4L V6 TBI, 5spd manual. Sonoma
                      1990 4Door, 3.2L V6 TBI, 5spd manual. 4X4. Trooper
                      Because... I am, CANADIAN

                      Comment


                      • #12
                        Originally posted by ericjon262 View Post
                        how much $$ to make it happen then.

                        Dave you have a bench too right?

                        I've got a set of L44 Fiero heads I will donate to the Cause also, and I should be able to get a set of Gen 2 castings front he J/Y.

                        I would love to see a side by side same bench comparison between the different heads. just stock flow numbers would be good enough for me.


                        I am serious.

                        Yep, it's been downgraded to flowing Briggs blocks, carbs and 1cyl Honda heads though.. lol



                        I think we talked about this a few years ago, It would be cool to get numbers all off the same bench.
                        Past Builds;
                        1991 Z24, 3500/5 Spd. 275WHP/259WTQ 13.07@108 MPH
                        1989 Camaro RS, ITB-3500/700R4. 263WHP/263WTQ 13.52@99.2 MPH
                        Current Project;
                        1972 Nova 12.73@105.7 MPH

                        Comment


                        • #13
                          I'll get the L44 heads cleaned up and on their way! one to you, one to Ben! Let's make this happen!
                          "I am not what you so glibly call to be a civilized man. I have broken with society for reasons which I alone am able to appreciate. I am therefore not subject to it's stupid laws, and I ask you to never allude to them in my presence again."

                          Comment


                          • #14
                            shipping those is going to suck, they are pretty heavy. lol


                            Sure, I'd be interested in seeing how different Ben's numbers are vs mine. We'll have to make sure we both flow with the same bore size too. I'd say 3.5" if he's got one.. if not we can come up with something.
                            Past Builds;
                            1991 Z24, 3500/5 Spd. 275WHP/259WTQ 13.07@108 MPH
                            1989 Camaro RS, ITB-3500/700R4. 263WHP/263WTQ 13.52@99.2 MPH
                            Current Project;
                            1972 Nova 12.73@105.7 MPH

                            Comment


                            • #15
                              Sorry, I am not flow testing the iron heads any time soon. Maybe some day.
                              Ben
                              60DegreeV6.com
                              WOT-Tech.com

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