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-   -   Mounting v6 4.3L on impala 77 l6 250 (https://www.hotrodders.com/forum/mounting-v6-4-3l-impala-77-l6-250-a-522603.html)

Husein-p 08-29-2019 05:42 AM

Mounting v6 4.3L on impala 77 l6 250
 
Hey guys
Haya doing

I com back with new plan

i wanna change my engine l6 250 to v6 262 4.3l 1987 and later
So If i wanna install v8 350 i need to 2 mounting brackets and v8 engine but for v6 262 is same too ? Or need to relocationg trans and ...
Tnx

techinspector1 08-29-2019 10:21 PM

Quote:

Originally Posted by Husein-p (Post 4691965)
Hey guys, Haya doing? I come back with new plan.

I wanna change my engine l6 250 to v6 262 4.3l 1987 and later.
So If i wanna install v8 350 i need to 2 mounting brackets and v8 engine but for v6 262 is same too ? Or need to relocationg trans and ...
Tnx

What is it that you are trying to accomplish by swapping in a V6 instead of using the I6 ?

d.b. cooper 08-30-2019 03:26 PM

The trans can stay in the same place----no need for a new crossmember.


v-8 mounts will work with a 4.3, but it's better to get 4.3 specific mounts.




i believe with impala,the engine mounts bolt directly to the front crossmember? If so, you will need to drill new holes in the crossmember for the 4.3; You have probably realized by now that the 4.3 is about 4.5" inches shorter than a v-8?


Sorry, don't have time to really discuss in detail now. May have more time this weekend.

55_327 08-30-2019 06:24 PM

Quote:

Originally Posted by d.b. cooper (Post 4692263)
The trans can stay in the same place----no need for a new crossmember.

FWIW, when I replaced the 250 six with a 350 in my 82 C10, I needed new "clam shells" (the brackets that mount to the engine). Also had to relocate the frame brackets to another set of pre-drilled holes on the crossmember.

Keep in mind there are several different models of clam shells, each with a different engine mounting height.

https://images-na.ssl-images-amazon....1SZy7hJy8L.jpg

BogiesAnnex1 08-30-2019 06:37 PM

Quote:

Originally Posted by Husein-p (Post 4691965)
Hey guys
Haya doing

I com back with new plan

i wanna change my engine l6 250 to v6 262 4.3l 1987 and later
So If i wanna install v8 350 i need to 2 mounting brackets and v8 engine but for v6 262 is same too ? Or need to relocationg trans and ...
Tnx


The 87 and later 4.3 is either Gen 1 or Gen 2 fuel injection and ignition unless these were different in your part of the world. If they are one of these electronic beasts, what are your plans to either use the electronic platform or convert to a carb and stand alone distributor?


At this point I'm thinking engine mounts are not the biggest issue you've got to solve, but not being there I don't know.



Bogie

Husein-p 08-31-2019 05:25 PM

Quote:

Originally Posted by BogiesAnnex1 (Post 4692285)
The 87 and later 4.3 is either Gen 1 or Gen 2 fuel injection and ignition unless these were different in your part of the world. If they are one of these electronic beasts, what are your plans to either use the electronic platform or convert to a carb and stand alone distributor?


At this point I'm thinking engine mounts are not the biggest issue you've got to solve, but not being there I don't know.



Bogie

Yeah you right

I wanna use hei distributer for this engine like older v6 or i can mix v8 and l6 distributer to make v6 model !
Right ?


Tnx 55 327



D.b.cooper tnx men you can tell me what deffrent between v8 mounts and v6 4.3 ?


Techinspector1 yeah i wanna change my engine and replace that with v6 4.3L but i think v6 like v8 so i can replace them without any problem yeah ?

techinspector1 09-01-2019 01:46 AM

Quote:

Originally Posted by Husein-p (Post 4692381)
Techinspector1 yeah i wanna change my engine and replace that with v6 4.3L but i think v6 like v8 so i can replace them without any problem yeah ?

If it's a matter of wanting more power, I would think that adding a turbocharger to the I6 would be a lot easier. And the I6 is already low static compression ratio, so puffing maybe 6 psi into the motor would make far more power than the V6 and the I6 would be detonation-resistant with the low SCR.

Husein-p 09-01-2019 07:33 AM

Quote:

Originally Posted by techinspector1 (Post 4692411)
If it's a matter of wanting more power, I would think that adding a turbocharger to the I6 would be a lot easier. And the I6 is already low static compression ratio, so puffing maybe 6 psi into the motor would make far more power than the V6 and the I6 would be detonation-resistant with the low SCR.

yeah my goal is higher power



but v6 have better low end torque and better mileage

and better exhaust sound !


making turbo charger headers is hard to me and a big problem of i6 is cooling v6 has better water cooling system and intake,exhaust system ..


for turbo i need inter cooler overall turbo for me is not good

natural aspirated engine is more lovely and has low maintenance cost



off topic subject question but short :
stock piston can be use again after rebuilding engine ?
this v6 is std but need to shave to about 20 or 30 pistons if i use stock v8 350 piston but healthy pistons is ok or not ?


tnx

55_327 09-01-2019 02:28 PM

This Edelbrock manifold with a small 4bbl, and maybe a cam would make a 4.3 come to life with no EFI or computers required!


https://www.summitracing.com/parts/edl-2111/overview/

techinspector1 09-01-2019 03:20 PM

[QUOTE=Husein-p;4692413
stock piston can be use again after rebuilding engine ?
this v6 is std but need to shave to about 20 or 30 pistons if i use stock v8 350 piston but healthy pistons is ok or not ? tnx [/QUOTE]

Yes, the V6 uses the same piston as the V8. Check piston to valve clearance if you use a hot rod cam.

cerial 09-01-2019 07:54 PM

The 4.3 is a dog. It was designed to be a 200k engine. It is more industrial based then hot rod based. The engine is also outdated. You missed the performance parts window. Any stuff you do find will be expensive.

The 250 can be built. Some of the things the Australians have done is amazing. But none of that stuff comes cheap.

Simple fact is if you want power your best bet is a v8. Run a 350 with vortec heads and around 9/1 compression. Good chance your going to exceeded the power of the above two out the box with lots of room to grow. Dollar for dollar a 350 will get you the most horsepower of these 3.

Dont get me wrong I like the 4.3. Never understood the 2.8. But I like the 4.3. The thing is a good engine as long as you respect it for what it is. You can improve them to make v8 power but you can make that same amount of power in a v8 with far less stress.

The 250 is also in the same group. Good engine when it is used as intended. But if you want to make more power, and have the room, and have a problem, and need help, and you can find them.
Then you need a V8.

d.b. cooper 09-03-2019 09:40 AM

Sorry cannot discuss further until the weekend, and even then it's not guaranteed.

Husein-p 09-22-2019 12:15 AM

Quote:

Originally Posted by cerial (Post 4692537)
The 4.3 is a dog. It was designed to be a 200k engine. It is more industrial based then hot rod based. The engine is also outdated. You missed the performance parts window. Any stuff you do find will be expensive.

The 250 can be built. Some of the things the Australians have done is amazing. But none of that stuff comes cheap.

Simple fact is if you want power your best bet is a v8. Run a 350 with vortec heads and around 9/1 compression. Good chance your going to exceeded the power of the above two out the box with lots of room to grow. Dollar for dollar a 350 will get you the most horsepower of these 3.

Dont get me wrong I like the 4.3. Never understood the 2.8. But I like the 4.3. The thing is a good engine as long as you respect it for what it is. You can improve them to make v8 power but you can make that same amount of power in a v8 with far less stress.

The 250 is also in the same group. Good engine when it is used as intended. But if you want to make more power, and have the room, and have a problem, and need help, and you can find them.
Then you need a V8.


tnq so much



i wanna have an egine with good power but with low mileage

if i wanna have just powerfull engine v8 is best of the best but my goal mileage with power



tnx


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