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Thread: 89 Chevy TBI to Carb
          
   
   

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  1. #1
    dcurtis's Avatar
    dcurtis is offline CHR Member Visit my Photo Gallery
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    89 Chevy TBI to Carb

     



    Just wondering what all I would need to do to go from TBI to Carburator in my 89 Chevy Silverado

  2. #2
    BigTruckDriver is offline CHR Member/Contributor Visit my Photo Gallery
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    A carburator.


    Just kidding ,I will post some links that might help out .Why do you want to change to a carb? I dont think these engine are big power makers because of the heads.The links will give you a few options to make horses with the tbi set up.

    http://www.cfm-tech.com/GM_tbi_bolt_...ifications.htm


    Check the tech section for switching to carb and other mods
    http://www.thirdgen.org/ultimatetbi
    Last edited by BigTruckDriver; 01-10-2007 at 08:38 PM.
    Friends dont let friends drive fords!

  3. #3
    dcurtis's Avatar
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    I've been looking forward to taking the truck and building a 400 horse engine for it, but everyone says the most I will be able to get with the TBI on top will be around 340 or less, and I would rather get rid of all the electrical stuff.

  4. #4
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    Quote Originally Posted by dcurtis
    I've been looking forward to taking the truck and building a 400 horse engine for it, but everyone says the most I will be able to get with the TBI on top will be around 340 or less, and I would rather get rid of all the electrical stuff.
    You can make about 350hp with a TBI but the tune and everything has to be right. TBI just don't support enough flow unless you went with a 454ss TB or Holley 2" bore.

    To go from a TBI to Carb, you will need to put a fuel pressure regulator on it so that it only flows 5-7 psi instead of the 11-18 psi currently. You will need to keep the computer so that the guages work and the lockup for the tranny still works. Any other questions, just ask.
    1990 Chevy C1500
    Not exactly stock

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