Disappointed magnum head flow numbers....

Mopar Performance Issues

  1. yellow rose

    yellow rose Overnight Sensation FABO Gold Member

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    There is more to making horsepower than cylinder head flow. That can’t be emphasized enough.
     
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    • pishta

      pishta I know I'm right....

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      "...in order to GO, you must FLOW"...where did that come from? I think head flow is the foundation that which all power is built upon.
       
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      • Brooks James

        Brooks James Dustoff

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        Ok, does this mean that mean that my set I will be making around 500 ho ?? Let’s be conservative 450 hp
         
      • Cuda416

        Cuda416 FABO Gold Member FABO Gold Member

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        Depends on the rest of the build.

        The issue is, it doesn't matter how you build the bottom, if the heads won't flow, you're not going to make the power without an adder. If the heads flow but them bottom end isn't built to make power, well, you make more than stock but not full potential.

        The engine needs to move fluids/gasses in and out. That's where the flow comes into play.
         
      • rumblefish360

        rumblefish360 So close, yet so far away FABO Gold Member

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        The flip side is how effective you are in;

        1; Making the most power out of what you have.
        2; How effective you are in utilizing that power to go fast.
         
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        • yellow rose

          yellow rose Overnight Sensation FABO Gold Member

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          Shape is more important than flow. All day long. A quiet port that doesn’t flow well in reverse is better than a noisy port that flows 85% in reverse.
           
        • Brooks James

          Brooks James Dustoff

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          I realize that I need good
          exh flow that is why I put a nitrous grind in it.
          I anticipate around 500 horse on the combo with 150 shot of nitrous I was hoping I could accomplish it on stock heads
          I don’t have the money for aftermarket heads that would definitely do the job
          I jus want an estimate nothing is chiseled in stone
          360 mag
          Stock block/ heads/ crank/rods/ 9:1 pistons
          Edelbrock knock off airgap
          MSD 6al my dizzy accel super coi904 w: 3500 converter
          Massaged 750 dp
          You already the specs on the cam engine is not that far off 380 crate
           
          Last edited: Apr 7, 2021
        • 318willrun

          318willrun Utube channel 318willrun

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          • flow at low lift is important
          • matching the rest of the car to the engine is important
          • having the car "work" in itself is huge.
          My point is, a well sorted out 385 hp powered Duster can beat a 485 hp powered Duster if the 385 mule is in a car that is well sorted out.
           
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          • rumblefish360

            rumblefish360 So close, yet so far away FABO Gold Member

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            Bingo dead on.
            Exactly what I was saying above.
             
          • yellow rose

            yellow rose Overnight Sensation FABO Gold Member

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            Point one is not what my experience says. For more than one reason. I look at the numbers below about .200 lift, but unless something is way wrong I don’t care about that.

            If you can test low lift at say...100 inches of water you’d see why the low lift numbers don’t mean much at 28 inches. Plus, the piston is in the way. Plus, you have to deal with cross flow at overlap. To fix that you have to reduce overlap and that’s a power killer.
             
            Last edited: Apr 8, 2021
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            • 318willrun

              318willrun Utube channel 318willrun

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              I should have said what I meant at low lift. .400
               
            • mgoblue9798

              mgoblue9798 Well-Known Member

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              With a 150 shot 500 hp should not be difficult to hit with magnum heads.
               
            • jos51700

              jos51700 Hemi Orange you glad it isn't a political avatar?

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              Listen, comparing flow numbers you found on the internet is like writing food reviews by reading the menu.

              #1 no two flow benches are the same.
              #2 no two operators are the same.
              #3 no two weather conditions are the same, and this matters because flow machines do not suck, they cause atmospheric pressure to blow.

              Notice I didn't even get into heads, valves, cam dynamics, etc. If you're reading flow numbers on the internet trying to decide what heads are best, you're not driving at a level that it will matter.
               
            • K.O. SWINGER

              K.O. SWINGER Meeting in the alley since 1976

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              Horsepower on a nitrous boosted motor at the kind of power level you're talking about is primarily affected by nitrous jetting. The Magnum head has a decent exhaust side which will help accommodate the nitrous. Head flow becomes a little less critical factor when injecting torque from a bottle. I personally wouldn't spend a lot of time on a set of Magnum heads unless you just love them. if you're going to upgrade then step up. But that being said 500 horse range is definitely achievable with Magnum heads on the juice.
               
            • Brooks James

              Brooks James Dustoff

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              Thanks, I did a lot of research to set this up. I figured that what I have now is close to the level of hp I could make without spending a lot more and keep from blowing the motor. I will be able to have lots of fun with 500 hp on the
              street, when I get traction set up. Off the juice it will be a 13 sec mild plus engine which my wife can still drive to the grocery store which is exactly what I want. and hopefully in the high 11’s on the juice, which I consider to be a respectable in a daily driver. It will be like what Hirohito said when the japs destroyed Pearl Harbor “I keel as if we have awakend a sleeping giant.”
               
              Last edited: Apr 11, 2021 at 3:31 AM
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