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Old February 19th, 2010, 11:20 PM   #1
jeepyj93
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Default want to convert 4.3L to carb

I have a friend that wants to put a chevy 4.3L v6 in his jeep, but wants to run a carb. Has anyone swapped from a TBI to carb? If so, What all parts do you need to change? I know the intake, distributor, ignition, fuel pump. But I found online that some say you hvae to change the cam too. Does anyone know if that is true? Thank you for any help.
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Old February 19th, 2010, 11:38 PM   #2
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Won't need to change the cam. They put a carbed 4.3 in some of the older mini vans. also you can get a spacer plat to adapt a carb onto the older TBI intakes and then you just need to change the distributor and put a fuel pressure regulator on it.
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Old February 20th, 2010, 02:35 PM   #3
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Has anyone converted a 4.3L from TBI to a carb? ANd what distributor did you use?
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Old February 20th, 2010, 04:14 PM   #4
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Find an old 4.3 that was carb. I had an 86 k10 w/4.3 that was carb. I think the early astro vans, caprice,c&k series truck all came with 4.3 as an option in the mid 80's. The dist. looks like a standard HEI, but diffrent pickup & cap.
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Old February 20th, 2010, 10:33 PM   #5
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there is a HEI Distributor for the V-6. Then its a 1 wire hook up.

http://www.summitracing.com/parts/PRO-67080/
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Old February 21st, 2010, 12:47 AM   #6
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Originally Posted by RADRICK View Post
Find an old 4.3 that was carb. I had an 86 k10 w/4.3 that was carb. I think the early astro vans, caprice,c&k series truck all came with 4.3 as an option in the mid 80's. The dist. looks like a standard HEI, but diffrent pickup & cap.
So would you be able to get a distributor for a carbed 4.3L, and use it on a newer engine with an aftermarket ignition control box?
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Old February 21st, 2010, 02:02 AM   #7
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yes msd makes a few distributors for these. conversion intake and dis. and your rollin
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Old February 21st, 2010, 10:52 AM   #8
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So would you be able to get a distributor for a carbed 4.3L, and use it on a newer engine with an aftermarket ignition control box?
So can i use a stock distributor from a carbed 4.3L and wire it to an aftermarket ignition box? Or do I need to buy an aftermarket distributor?
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Old February 21st, 2010, 10:22 PM   #9
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I've done this before when I put a 4.3 in my Samurai.

You don't have to change the cam in the TBI motors. The later distributorless engines do not have a cam gear.

The only year for the quadrajet carb on the 4.3 astro is 1985. That intake is very tall, and is basically a factory tunnel ram.

Fullsize cars and trucks used a 4 barrel in 85 and 86.

The HEI distributor from those vehicles is the computerized large cap. It will not work without some mods.

Basically, you need to pull the guts out of the 4.3 distributor and replace the ignition module from a 70's HEI V8. You retain the six point pickup, but eliminate the computer function. This is what I did with my 85 astro distrubutor and it worked fine.

You can also find a 81-86 Chevy 3.8 90 degree V6 (distributor in the back) HEI distributor from a G-body car. You will need to do the same module swap unless you find a Canadian car, in which they ran the old one wire style. If you happen to find a canadian 3.8 V6 in a junkyard, pull the exhaust manifolds as well, as they are non-emission block hugger style that will bolt to a 4.3 but take up much less room than all the factory 4.3 manifolds. They are getting very hard to find and somewhat valuable.

Also, you will need to run an electric fuel pump, as the TBI motor does not have the provision for a mechanical fuel pump.

Last edited by kkodet; February 21st, 2010 at 10:28 PM.
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Old February 21st, 2010, 10:31 PM   #10
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I am not sure if this helps you at all but the 4.3 came equipped with a carb in some marine applications. You may be able to scavenge some parts from one.
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