Question about 1978 Chevrolet C1500

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I need to know how to convert a throttle body carb to a 4 barrel

I have a 1989 305 engine that i put in a 1980 truck and i don't want to use the computer so i need to know what i need to do to convert the throttle body carb to a regular 4 barrel carb i have already changed the distributar.

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  • Dar
    Dar May 11, 2010

    I think you would have to change the intake manifold, and i don't think the bolt holes are the same. So then, you'd have to change heads. Correct me if i'm wrong, but i seem to remember trying that once.

  • blaine grant
    blaine grant Jan 31, 2014

    what about the wires to the throttle body



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You can buy an itake to convert it you dont need to change the heads the 4 center bolts have just a slightly differant angle then change the distributar slap a carb on and put an inline fuel pump and your good to go

Posted on Feb 13, 2010

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Change the intake manifold,but match them up closely because the pitch changed a little where it bolts up to the head.worst case is to change the heads to older ones

Posted on May 17, 2009

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I have a 1988 Chevy 1 ton truck with the 350 motor. I have had so many problems with the throttle body, wanting to change it carb. What all is involved with doing this. I am not willing or have the money to buy a new throttle body, this truck has cost me so much money I am about done with it. Or where can I buy a rebuild throttle body for it, The town I live in has noting, and no one here will work on the TB Thanks Becky

Posted on Aug 21, 2011

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Posted on Jan 02, 2017

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SOURCE: converting a throttle body carb toa 4 barrel carb

Put a 4 barrel intake manifold on it.

Posted on May 17, 2009

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I have a 1991 Isuzu Rodeo with a V6. When I take the air cleaner off I can see gas leaking from some sort of modulator or something just to the right at the very top.

which engine?
The V6 , it has a real name.
there were 3 v6s used.
what displacement?
sounds like the 3.1L GM V6, not the isuzu 3.2. (2 kinds too)
The GM is the LG6 engine, GM name.
the last carb car , in USA was ISUZU, in 1994.
and before that some very odd , electric carbs. (avoid those)
in 1991
there were 4 engine (1 I4 and 3 V6)
ONLY the 2.3L 4 banger was carb , 2 barrel;
the 3.1L is and was, TFI , so is NOT A CARB.
This TFI has a Real ECU, (EFI system)
and the injector does have seals and can leak.
buy a seal kit and put it in,.
TFI means throttle body injected, x2 in this case
the book shows how to do this, (at mitchells) log in, and read?



the steps. are clear.
he engine is equipped with 2 fuel injectors; both are located in the throttle body.
  1. Relieve the fuel pressure. (ask)
  2. Disconnect the negative battery cable.
  3. Remove the air cleaner.
  4. At the injector electrical connectors, squeeze the 2 tabs together and pull them straight upward.
  5. Remove the fuel meter cover and leave the cover gasket in place.
  6. Using a small prybar, carefully pry the injectors upward until they are free of the throttle body.
  7. Remove the small O-ring from the nozzle end of the injector. Carefully rotate the injector's fuel filter back-and-forth to remove it from the base of the injector.
  8. Discard the fuel meter cover gasket.
  9. Remove the large O-ring and back-up washer from the top of the counterbore of the fuel meter body injector cavity.

Dec 03, 2016 | Isuzu Cars & Trucks

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Carb will not idol down 383 4 barrel

Throttle body butterflies not closing correctly. Check that throttle shaft moves freely, check that the accelerator cable moves freely, check the throttle return spring tension, check carb base and intake manifold for vacuum leaks.

Mar 29, 2015 | Cars & Trucks

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Why four barrels do not open 65 4100 carb

The choke linkage is not properly hooked up or adjusted. The throttle linkage is not adjusted properly or there isn't enough vacuum. The choke linkage has a tab that prevents the 4 barrels from opening when the choke is engaged. There is a tab on the throttle linkage from the front 2 barrels that will engage the secondaries when they rotate past a certain point. Vacuum opens the top plates on the secondaries.

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I am changing a1994 silverado 350 5.7 throttlebody with a 650 edelbrock 4-barrell carb.already atop another intake that fits,weill i have problems because of the left over throttle body wires

Its going to be a major job. The in-tank pump produces 10-15 psi which is twice the amount a carb can handle. The float in the carb will not cut that much pressure off.
And the engine computer must have the TPS sensor to function.

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Passing emissions test

I suggest you change the oil just before the testing is done and get the engine as hot as possible as well. Another thing you can do is clean the throttle body where air enters the engine with throttle body cleaner. If neither of the above work then you may need a new catalytic converter.

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I need a diagram of a 4 barrel carb. i don;t know what a mixture screw adjust butterfly position and float level means.

The mixture screws are at the bottom front of the 2 front barrels. They poke into the barrels from outside the carb.
Butterfly usually refers top the throttle plates that open and close the barrels, but if you have a quadrajet, they may also refer to the upper plates on the back 2 barrels that only open when the throttle is wide open.
The float level is the distance of the top of the float when the float valve is closed. As gas flows into the bowl thru the float valve, the float rises and eventually closes when the proper float level is reached by the gas.

Look here for example:

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1 Answer

I want to put a chevy throttle body on a dodge with a 360 with a 2 barrel carb how do i do it?

First before we get started on this, we need to know if you have all the fuel management system to go with the throttle body??? (ECM, O2 sensors, cam,crankshaft sensors, and MAP sensor) and a few other that i may have missed and also the wiring harness to make it all work together to make the Throttle body work with the proper fuel injector pump.
Keep me posted and let me know and we can go through the whole picture when you have all that and we can also chat about how to tune your ECM to the engine and how we are going to keep it emission legal since it's going to be fuel injected, it's no longer exempt from emissions like the carbureted engines.
Thank you for using Fixya and be glad to help you convert your 360 dodge in to a fuel injected engine.

Mar 17, 2010 | 1998 Jeep Grand Cherokee

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I would like to know if you can change a tbi over to a carb on a 4.3 v-6.

You can but your going to put lot's of money and time in to it. The electronic's to the throttle body is tied in with the ecm which also controls the transmission shift points and firmness to the throttle body blade position. If you change it of to the Carb your going to have to replace the intake manifold and and distributor and buy a painless wire harness to tie in with the transmission shift points and you may even have problems having the truck pass emissions if there are any missing for the year and make of vehicle. Unless your going to have it off road use only like a race car. Used to be a time where it was free for all then it changed that you can not even swap a older engine in a car older then it's mauvatured date which mean you can put a 2009 corvette engine in your truck but can not put a 1979 corvette engine in it if your truck is 1980. 

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Car not getting fuel

If it is a 1980 Caddy it either has a carburetor or throttle-body fuel injection( V864, if it's fuel injected you might need a new fuel pump or fuel pressure regulator ) and you can remove the aircleaner lid and pour a little gas down the carb (hold the choke plate open with a screw driver placed between choke plate and carb air horn) or throttle-body. It might take a few tries before the fuel pump fills the float bowl up on the carb for it to keep running. If the cars has really old stale gas in the tank you might need to drain it and refill with fresh gas. Change the fuel filter and add a can of fuel injector-carb cleaner to the gas tank.

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