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Old 10-25-2011, 01:52 AM
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4.3 to 5.7 engine swap?

i am going to swap my 4.3tbi for a 5.7tbi. i need to know what all is interchagable and what i need to change out main things i really need to know are if you can use the tbi off the 4.3 for the 5.7 and if you can use the computer or not? any help would be great thanks

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Old 10-25-2011, 07:33 AM
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Just a suggestion. Try using a little more punctuation in your sentences and be a lot more specific in your question. To give you a really good answer you need to be more specific. Ie: type of car, what parts you already have, parts in question that you need. Stuff like that.

I have no experience with newer cars and engine swaps, but from what I hear from other people the computer system will not work. Your going to bigger motor, its going to need more fuel, also engine characteristics will be different.

My $.02
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Old 10-25-2011, 08:18 AM
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I'm assuming a truck? If so, I did a similar setup in my 86 GMC last year. 4.3/3-speed manual to a 350/350 setup. I can't help with the TBI, as mine had a factory non-electronic Q-jet. If you have a truck, you will have to move the frame mount brackets forward and use different frame and engine mounts(for a V8). That is the worst part of the change(really easy actually)
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Old 10-25-2011, 08:30 AM
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I dont believe the comp will work because of the fuel issue the 4.3 doesnt take as much fuel as the 5.7 and im almost sure the trottle body will work but you will have decreased power due the the size of the injectors. also something im not sure about is the tranny w/ the 4.3 i know it will bolt right up but i believe they are built a lil different due to less power from the V6. And i'm assuming ur stuffing it in a 1500 instead of an s-10. if so the engine mounts will be the easiest part of the conversion!! JMO
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Old 10-29-2011, 08:11 AM
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dont answer if you dont know.

if your not going to post useful information then dont post anything at all. and chevykid90 anyone that knows anything about vehicles could answer my question with what i asked they did on other forums and they did at the chevrolet dealership. transmission will work fine computer will work fine as long as the 350 stays stock and injectors would workbut would be better to change them
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Old 10-29-2011, 08:38 AM
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WELL ANOTHER THING YOU COULD DO IS STAY ON THE OTHER WEBSITES! There are alot of ppl on here with perfect experience with the swap your doing and the site has been very helpful to millions os ppl sorry ur experience with the site was not so wonderful....
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Old 10-29-2011, 11:21 AM
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454, what turns your crank?
 

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If you already got your answer on other forums than why did you come here and ask the same question? Seems like you already knew the answer to your computer question... Also it just seems logical with these new computer controlled engines that using the parts designed for that specific engine should be used, and not smaller going onto something bigger.
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Old 10-30-2011, 05:13 AM
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oh i have had plenty of help on this site just not from you. and i posted this one first and hadnt gotten anything useful so i posted a few others
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Old 10-30-2011, 06:34 AM
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I'm still curious as to what vehicle this is.
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Old 10-30-2011, 04:04 PM
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Quote:
Originally Posted by downen
i am going to swap my 4.3tbi for a 5.7tbi. i need to know what all is interchagable and what i need to change out main things i really need to know are if you can use the tbi off the 4.3 for the 5.7 and if you can use the computer or not? any help would be great thanks
I swapped a setup like yours in an 88 astro van, it screamed.
I kept the same trans and torque converter
I used the same computer
same front engine bracket accesorie drive setup and all
I had to get a tbi intake from a 350 from a salvage yard, as the V6 wouldnt work obviously
I had to change the Dizzy to a salvage yard dizzy from a 350,same as above
the wiring was practically the same
It tuned itself from the PROM in the ECM and ran fine
Fuel pump was not changed
I even used the same radiator
Motor mounts were different, I had to get mounts and engine pedestals from another donor truck.
I had to change the exhaust
I was even able to charge the AC and it worked good
piece of cake, just took time and money
BTW the injector (some models) were different on a 5.7 than those on a 4.3
even though it bolted on , we had to change the Throttle body to a 5.7 one to get it to run right.
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Old 10-30-2011, 11:41 PM
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thank you that was very helpful info
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Old 10-31-2011, 11:22 AM
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Quote:
Originally Posted by downen
i am going to swap my 4.3tbi for a 5.7tbi. i need to know what all is interchagable and what i need to change out main things i really need to know are if you can use the tbi off the 4.3 for the 5.7 and if you can use the computer or not? any help would be great thanks
The swap is in what? A 4.3 to 5.7 in a full size pick up or van is one thing and pretty simple. The same swap into an S10/15 is quite something else in terms of effort and cost.

Bogie
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Old 11-01-2011, 03:28 AM
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its a chevy 1500
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Old 11-04-2011, 09:14 PM
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Quote:
Originally Posted by downen
i am going to swap my 4.3tbi for a 5.7tbi. i need to know what all is interchagable and what i need to change out main things i really need to know are if you can use the tbi off the 4.3 for the 5.7 and if you can use the computer or not? any help would be great thanks
The injectors themselves will need changed but the body/housing will not, as well as the PROM in the ECM/PCM unless you have chip burning tools. These modules are Year specific and unless you are confident with re-pining to a different ECM/PCM I would just get your modules Service# and find the corresponding 350 EPROM and slap it in. If you don't, it will run, but it won't run properly. Oh,and you might still have to change a few wires around in the harness!
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Old 11-04-2011, 11:21 PM
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Quote:
Originally Posted by downen
i am going to swap my 4.3tbi for a 5.7tbi. i need to know what all is interchagable and what i need to change out main things i really need to know are if you can use the tbi off the 4.3 for the 5.7 and if you can use the computer or not? any help would be great thanks
First off Your not telling anyone what you starting with I could assume a lot!
If its was a car verse a truck! Now the mechanical swap is the same. But Now that I know it a truck I would point you to a site where this is done all the time and you can read how other have done there trucks! www.fullsizechevy.com
Just remember the more info you give the better the help you will get and one does not assume!! You do no the one about assuming??


Craig
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