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Thread: Intake shopping
          
   
   

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  1. #1
    redrodman48's Avatar
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    Intake shopping

     



    Its time I gave the old Iron manifold the heave ho and throw a new alum on
    Question is which one? a 428/390 HP stock motor only upgades are Headers
    and MSD Ignition. I was thinking prob Edelbrock Performer Rpm ,any other
    ideas? I`ll be putting a 750 Holley or 750 edelbrock back on it
    Confusious say: He who dies with the most toys, Wins

  2. #2
    techinspector1's Avatar
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    Depends on your rpm range.....
    PERFORMER® MANIFOLDS (Idle to 5500 rpm)
    PERFORMER RPM™ MANIFOLDS (1500 to 6500 rpm)
    The rpm runners will be higher volume and are intended for use in a higher rpm motor where runner velocity will be high enough to pack the cylinders properly. On a daily driver, the RPM will not be passing enough CFM to keep velocity up for good cylinder packing and the motor might run worse than it did with the stock manifold, particularly at lower rpm's.
    PLANET EARTH, INSANE ASYLUM FOR THE UNIVERSE.

  3. #3
    mooneye777's Avatar
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    if you are not changing anything else, the performer is your better choice, not the rpm performer. Dual plane is a better choice for you.


    Live everyday like it were your last, someday it will be.

  4. #4
    IC2
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    Either manifold will work as they are both dual plane though Edelbrock claims a higher RPM band for the RPM version.

    A 750cfm carb is WAY, WAY too big for a street driven car that sees little high rpm operation. The OEM 460 Ford ran a 500-525 cfm and got reasonable(??) gas mileage for the time. I tried a 780 Holley 3310-1 on my long gone '79 460 truck - gas mileage went from poor to abysmal and with the performance also going away.

    Here's the industry accepted formula for determining carb cfm:

    CID x RPM x V.E. / 3456 = CFM

    428 x 3000 x .85 / 3456 = 315cfm

    428 x 4000x.85 / 3456 = 421cfm

    428 x 5000 x .85 / 3456 = 526cfm

    428 x 6000 x .85 / 3456 = 631 cfm

    Looks like I'd be considering a 600 to 650 max carb Which means at any of these RPM figures, you don't need that much carb. And with gas at $3.75/gallon,,,,\\\\\////???
    Dave W
    I am now gone from this forum for now - finally have pulled the plug

  5. #5
    redrodman48's Avatar
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    I goofed, it was a performer I was looking at, not the RPM, and the reason I
    was going with 750`s is thats whats sitting on my work bench.The car came
    with a 750 originally and worked fine. PS the 428 is a Pontiac, not a Ford
    Confusious say: He who dies with the most toys, Wins

  6. #6
    IC2
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    Quote Originally Posted by redrodman48
    I goofed, it was a performer I was looking at, not the RPM, and the reason I
    was going with 750`s is thats whats sitting on my work bench.The car came
    with a 750 originally and worked fine. PS the 428 is a Pontiac, not a Ford

    Either brand, Ford or Pontiac, volumetric efficiency is, well volumetric efficiency in general terms the same - a 750 is too big. But, with that said - your car, your performance and your gas tank that needs to be filled - go with it
    Dave W
    I am now gone from this forum for now - finally have pulled the plug

  7. #7
    redrodman48's Avatar
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    Well when it comes to summer drivers, Im not too worried about how much
    fuel gets sucked up
    Confusious say: He who dies with the most toys, Wins

  8. #8
    IC2
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    Quote Originally Posted by redrodman48
    Well when it comes to summer drivers, Im not too worried about how much
    fuel gets sucked up

    Will you adopt me then? Until later this summer, I only have a 9-10 mpg pick up and I only eat a little
    Dave W
    I am now gone from this forum for now - finally have pulled the plug

  9. #9
    redrodman48's Avatar
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    Sorry , I got that one covered too
    Confusious say: He who dies with the most toys, Wins

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