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  1. #1
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    Default Dual TBI setup on Vortec 5.7?

    I am thinking about a dual 4 bbl intake manifold with TBI to square bore adapters, and running dual TBI units.

    94 Suburban 1/2 2wd. I am replacing the blown 5.7 that came in the truck, with a standard 5.7 TBI for now.

    I am contemplating rebuilding the stock 5.7 and going to a 383, with performance cam, rebuilt and port the heads, etc.

    Research says that even a "Turbo City" rebuilt TBI runs 590 CFM compared to 520 CFM in stock configuration.

    I have not seen a "Vortec" pattern intake manifold in a dual carb configuration. I know "Professional Products" make adapters to allow a standard small block intake to be used on a Vortec application, so I could use an easily found dual quad intake manifold.

    What obstacles would I encounter trying to make the 2 throttle bodies work together?

  2. #2
    <*{{{>< 1990GMCSIERRA's Avatar
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    find u a crossfire corvette they had the twin throttle body set up
    Royce Anthony (Tony) Prater

    1990 GMC Sierra RCSB
    350,.30 over,Flat Tops,Small Cam,E-Fan,More To Come
    3.73 Posi,4-6 Drop.Panther Juice 5 20's
    Shorty Headers,True Duals W/Flowmaster 10's

  3. #3
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    I have heard that they are very problemmatic.
    I have seen several dual quad carb small block chevy intake manifold recently. Transadapt makes several adapters to go from 3 bolt TBI to square bore carb, and they even offer "front or back" positioning, to allow you to have the TBI up close to the front of the intake or more towards the back for spacing accomodations.
    Add a 2nd TBI from a salvage yard, and the main components are done, beyond linkage and fuel lines, which I can built with Aeroquip/Russell/Earls through work.

    My biggest question is injector firing, and sensor compatibility.

  4. #4
    <*{{{>< 1990GMCSIERRA's Avatar
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    my dad always had trouble with it,thats why he sold it
    and ull need a computer tune afterwards or theres no way itl run right
    on a stock engine i really think ud be wasting ur time and money cuz ud prolly drownd it
    id just build u a motor
    Royce Anthony (Tony) Prater

    1990 GMC Sierra RCSB
    350,.30 over,Flat Tops,Small Cam,E-Fan,More To Come
    3.73 Posi,4-6 Drop.Panther Juice 5 20's
    Shorty Headers,True Duals W/Flowmaster 10's

  5. #5
    Warranty Killer! DRAGGIN95's Avatar
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    I always thought it would be fun to try out a dual tbi setup, but I am sure it would be more difficult to get dialed in.

  6. #6
    <*{{{>< 1990GMCSIERRA's Avatar
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    dual carbs are hard enough to keep right
    and carbs are simple,
    o yea itd definatly be something eveyone one doesnt have
    plus itd be awful intimidating to somone if u pop the hood and uve got 2 throttle bodies sittin there
    Royce Anthony (Tony) Prater

    1990 GMC Sierra RCSB
    350,.30 over,Flat Tops,Small Cam,E-Fan,More To Come
    3.73 Posi,4-6 Drop.Panther Juice 5 20's
    Shorty Headers,True Duals W/Flowmaster 10's

  7. #7
    Nooo! Noooooo MIHELA's Avatar
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    Dual carbs have to be set up individually. Dual TBI doesn't if you run it on a Megasquirt or some other programmable fuel injection. You would have to buy a dual carb Vortec manifold and 2 TBI adapters, and fab up a linkage and plumbing. I think it's totally do-able, and would give you better control over fuel than a single TBI.
    "Steve" - 1995 Chevrolet Silverado - Starline westerner conversion package
    4WD, 5.7 TBI, 5 speed manual, Z-71 package, 14 BSF, E-fans

  8. #8
    I'm Awesome Crash's Avatar
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    Nice $300 manifold
    Edelbrock 7526

    95 305 5spd xcab sb 285/70R17
    http://www.pickupandracehaven.com/

  9. #9
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  10. #10
    I'm Awesome Problem2420's Avatar
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    thats sick!!
    1990 crate 350 tbi,spintech exhaust, high flow cat, headman headers and y pipe, 3:73 gears, 2/4 drop, 275/50/17,2'' wheels spacers rear,led interior lights,custom taillights,intake,454ss gauges,headlight covers,bmw shark fin antenna,evo vortex generators,hids,2000 stall tq,shift kit,cut out .future mods: cam(in the garage) stage 2chip, vortec heads,supercharger, posi,275/55 rear tires

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