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View Full Version : Will 4.3l V6 bolt in to replace 5.7l V8 ?


MundusPax
01-30-2010, 01:16 PM
Looking to swap a 4.3l V6 to a 95 2dr Tahoe
Just wondering if it would bolt in or would the engine mounts have to be modified ?

FU Toolbag
01-30-2010, 08:32 PM
It was a factory option. Should fit.

xtremeyj
01-30-2010, 09:17 PM
Why? the wiring harness and computer will all need to be changed as well. Thats alot of work to get a V6

MundusPax
01-31-2010, 12:12 AM
Why? the wiring harness and computer will all need to be changed as well. Thats alot of work to get a V6

the 4.3l came with throttle body injection too didn't it ?
when programming my chip I saw an option for V6 so computer should be ok with just new program

Bigger problem for me would be to bolt it in, if engine mounts are the same I should be ok with the rest. Especially since I'm planning for manual transmission.

FU Toolbag
01-31-2010, 12:08 PM
95, is that tbi or vortech? Apparently you can use the same harness and everything if it's a tbi.

duff
01-31-2010, 12:40 PM
why bother, less power, probley worse fuel millage from that little v6 working its ass off all the time

MundusPax
01-31-2010, 05:26 PM
why bother, less power, probley worse fuel millage from that little v6 working its ass off all the time

4.3l isn't little, and I have a few ideas of lowering the total weight
highway milage should be less, city/off-road questionable though manual should help
Towing capacity will suffer but I don't have anything to tow
???????

85chevy
01-31-2010, 05:28 PM
Pretty sure the 4.3 is a 350 with 2 cylinders taken off so probably not a whole lot of difference

MundusPax
01-31-2010, 05:33 PM
95, is that tbi or vortech? Apparently you can use the same harness and everything if it's a tbi.

it's TBI
Vortec started in 96

InteriorZR2
01-31-2010, 07:17 PM
Some of the 95 4.3's were SFI, they switched back to TBI in 98.

duff
01-31-2010, 08:12 PM
its a tbi 4.3???? dude that truck is going to be a gutless dog, your gona have your foot to the floor all the time beter off with the v8 mark my words, be shure to post your results when your done, cheers...

85chevy
01-31-2010, 10:56 PM
The blocks in those motors are a chevy 350 block minus 2 cylinders so they bolt up the same that is y u can take a 4.3 out of an S10 and reuse ur serpentine system with a V8 they are identical front and rear. Vortech means the heads are different and they are gas pigs stick with the V8 or ur gonna be wasting ur cash and getting even worse milage trying to move a heavy rig with a gutless motor.

B
02-01-2010, 12:53 AM
its a tbi 4.3???? dude that truck is going to be a gutless dog, your gona have your foot to the floor all the time beter off with the v8 mark my words, be shure to post your results when your done, cheers...

The blocks in those motors are a chevy 350 block minus 2 cylinders so they bolt up the same that is y u can take a 4.3 out of an S10 and reuse ur serpentine system with a V8 they are identical front and rear. Vortech means the heads are different and they are gas pigs stick with the V8 or ur gonna be wasting ur cash and getting even worse milage trying to move a heavy rig with a gutless motor.


[stupid] ..... total waste of time and money

pumpkin
02-01-2010, 06:46 AM
The truck is not geared for a 4.3. My buddy went the other way in a pu. Got better fuel economy and of course nore power with the 350. You will be doing all this work for a huge dissapointment.

MundusPax
02-03-2010, 09:54 AM
[stupid] ..... total waste of time and money

I don't know if I should read your comment or stare at the boobies, very distracting
mmmmm.... ;) hehehe

FU Toolbag
02-03-2010, 06:18 PM
I don't know if I should read your comment or stare at the boobies, very distracting
mmmmm.... ;) hehehe

I have that problem all the time.

ottoman
02-06-2010, 09:44 PM
got to change & move engine mounts & change ecm

Trooper
02-07-2010, 12:35 AM
I put a 350 in my trooper from the stock v6. I saved about 15% in fuel economy with 35" tires. The 6 is gutless you can make then decent but you gotta dump allot of coin into them. Not worth it