Tunnel Ram Carbs for 383?

Fuel and Air Systems

  1. JGC403

    JGC403 Well-Known Member

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    I emailed Holley to see what carbs the recommend for my 383. They replied with the: 0-1850c vacuum secondary.

    Anyone using these carbs? Or what carbs are you using with a tunnel ram?

    Just not sure how tunable these carbs are, I'm going to try and get the most out of it possible.

    383 specs:
    Mopar purple solid cam: 284 duration, 0.528 lift, 110 Centerline
    Ported "906" heads using MP templates
    10.0:1 compression
    1.625" or 1.75" primary pipe headers (haven't decided what size yet)
    A-833 transmission
    Weiand Hi-Ram Tunnel Ram
    HEI ignition system
    Wideband O2 sensor
     
  2. RustyRatRod

    RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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    They are very tunable, but 1200 CFM for a mild 383 is stupid, IMO.
     
  3. Mrmopartech

    Mrmopartech Well-Known Member

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    If 1200cfm is too much,then every one with a 340/383/440 6 pack,with a rating of 1350cfm should toss there carb set up in the trash,just making a point.Since I have a 383 with dual quads on a weiand tunnel ram on a 383,I will go out and remove it and send it to the scrap.mrmopartech
     
  4. RustyRatRod

    RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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    He asked for opinions. That's mine and I stand by it. I would use two small Edelbrocks any day over 1850s.
     
  5. bowtiehunter

    bowtiehunter Member

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    I have been thinking about finding a dual four for my 273.. I would run the dual four setup from FiTec.. Seems to me they have their stuff together...
     
  6. mguner

    mguner How many is too many?

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    1850's are vacuum secondary 600s..... How small an Eddy can you get? 1850s are easy to come by and often you can buy them by the pound at your local scrap yard if you look in their dirty die cast bins. Common on a lot of old Fords.
     
  7. mguner

    mguner How many is too many?

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    You'll probably end up jetting them around 62 on the primary with 4.5 power valves.
     
  8. rumblefish360

    rumblefish360 So close, yet so far away FABO Gold Member

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    That's the rating for 2bbl. carbs which is at a different pressure drop than the 4bbl. rating. Which makes the 3X2 Holley rated around the 950 cfm area.

    Edelbrock has the AFB and AVS style carbs at 500cfm.
    I'm don't know what part of the world you guys are in for old used carbs to be sitting around collecting dirt for this long of a time. Around here, shelf life is very short for used cars.
     
  9. mycuda

    mycuda FABO Gold Member FABO Gold Member

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    I am running 2- Holley older 460cfm carbs on 383 weiand tunnel ram.
    50 cc squirters. Tried larger carbs, too much fuel. This setup runs awesome
    with mild built 11:1 engine.
    I can get #s off carbs if anyone wants to compare to whats available.
    2" fenderwell headers also
    D.
     
  10. Marcohotrod

    Marcohotrod Well-Known Member

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    hey JGC-go with the 1.75" headers, 1.625" are too small for big block ports. the holley guy is not going to say use a carter/edelb carb. I say go 500 carter/edelbrock. and yes, mrtech, 2 barrel and 4 barrel carbs are rated different, and was not the center carb on a 340/6 smaller than a 440/6? and I would not dig for any old holleys, if U want to dig for old small stuff carter made 400 afbs
     
  11. mguner

    mguner How many is too many?

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    Something else to consider is a pair of large two barrels.... 500s or 650s
    [​IMG]
     
  12. 1Fast340

    1Fast340 Well-Known Member

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    If it was my engine i would take a long hard look at a pair of 500cfm edelbrock carbs they tend to work quite good straight out of the box on milder tunnelramed engines.
    They have tiny primarys that gives awsome drivability at lower rpms and small throttleopenings.
    Might not be optimum but they tend to be very easy to work on and wont take much time to make work nice out of the box.
     
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