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Thread: Which headers

  1. #1
    Senior Member EXPERT BUILDER
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    Which headers

    This is my current combo and I need to buy new headers.This car also runs on Alky.What size tubes and would this benefit from step headers?

    383 sbc,hooker super comp 1 3/4 #2131 headers,comp .558 550,260,266 at .050,108 on 104 icl,14-1,dart iron eagle 215 platinums ported,2.05 1.6 valves bowl blended and port matched to a 2925 super victory,alky 810 carb,power glide,4.56 gears,4800 convertor,3100 lb car.This is a 1/4 drag car.Here are the flow numbers:


  2. #2
    Senior Member RACING JUNKIE
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    I would suggest 1 7/8" Hooker super comps., they come with stahl adaptorplates (7 bolt conversion) that is what i have on my 377" on alcohol and i also ran them on the 406" before i broke a rod bolt. They work well and are inside the frame on my Malibu, but i did have to install turn outs to keep the fumes out of the car.

    JMO

    Zip.

  3. #3
    Senior Member SENIOR BUILDER
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    Quote Originally Posted by zipper06
    I would suggest 1 7/8" Hooker super comps., they come with stahl adaptorplates (7 bolt conversion) that is what i have on my 377" on alcohol and i also ran them on the 406" before i broke a rod bolt. They work well and are inside the frame on my Malibu, but i did have to install turn outs to keep the fumes out of the car.

    JMO

    Zip.
    x2
    -for sure not over 2"

  4. #4
    Senior Member EXPERT BUILDER
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    Here is why I'm asking.......The exhaust port on my head is .080 wider then the width on the header on all exhaust ports.My question do you think this is hurting performance?This car has run [email protected]

  5. #5
    Senior Member RACING JUNKIE
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    Quote Originally Posted by et7333
    Here is why I'm asking.......The exhaust port on my head is .080 wider then the width on the header on all exhaust ports.My question do you think this is hurting performance?This car has run [email protected]
    I would think that it is hurting, i don't know how much, but with the 1 7/8 you're increasing the tube size by .125 plus you have the option of tapering the adaptors to match your cyl. head ports in case they overlap the head ports. I would think any opening smaller than the ex port would cause some turbulance instead of good flow.

    JMO

    Zip.

  6. #6
    Senior Member RACING JUNKIE TheYellaBrick's Avatar
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    That's a fact Jack ! Not only are you pushing through a physically smaller opening but you also add in the 'laminar' layer (although infinitesimal) and the opening gets even smaller. ANY 'edge' will be a larger restriction than it 'looks'. Blending with a shallow taper can reduce that significantly. as per a venturi.
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