Engine Swap Everything about swapping an engine into your Third Gen.....be it V6, V8, LTX/LSX, crate engine, etc. Pictures, questions, answers, and work logs.

v6 to v8????

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Old Mar 26, 2003 | 07:42 PM
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v6 to v8????

what would it take to change a v6 to an old non computer 350 besides motor mounts? i have 700r4 tranny in a 90 rs!
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Old Mar 26, 2003 | 09:40 PM
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From: Northwestern Pennsylvania
Car: 1985 Pontiac Trans Am
Engine: 355 with stuffs.
Transmission: 700R4
Axle/Gears: 4.10 Posi
I totally read your post wrong, sorry. you shouldn't need much to convert it, you'll have to move the brake line that's under the engine (just move it back to the V8 spot). A V6 transmission WILL NOT BOLT UP TO A V8! A V8 700 r4 will bolt directly into your car without any mods, you don't have to mess with the driveshaft or anything, it's all a direct fit. you will have to change the fuel pump too. If I think of anything else I'll edit this post.

Last edited by Quick_Trans_Am; Mar 26, 2003 at 09:44 PM.
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Old Mar 26, 2003 | 10:07 PM
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you also have to change front springs, radiator, you dont have to replace the fuel pump if you buy a AFPR, and just put the motor mounts in the furthest foward holes. oh yeah, have to change the tach too.
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Old Mar 27, 2003 | 12:08 AM
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u might not have to change the radiator if ur radiator hose is on the driver side u dotn have to change it cause its teh same one as the v8
if the rad hose is on the pass side u have swap out that piece of **** for a good one

i checked the part #s too im not jsut guessing
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Old Mar 27, 2003 | 08:56 AM
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Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Unlike the earlier V6 cars, the later ones seem to use the same radiator as V8 cars.

However...

The one part you should not consider starting this swap without is a factory V8 donor car. Even if you don't use the engine, there are so many "little" things you need that the only sane way to try it is getting a car that already has all the parts. Some things, like the engine-side motor mounts, aren't available from parts stores. Even if you do find all the parts somewhere, you'll likely spend more money getting them than you would if you just bought a donor car.

That's especially true if you need this thing to pass emissions when you're done.

Last edited by five7kid; Mar 27, 2003 at 08:59 AM.
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Old Mar 27, 2003 | 09:20 AM
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thats exactly what i did i bought a piece of crap from my friend (86camaro) all it needed was a coil to run but his loss is my gain
so what i did was rip the car apart and sold everything well im in the process of selling everything
i paid 200 for the car and i got all the **** i need off the car and made a little money in the process
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Old Mar 27, 2003 | 05:17 PM
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Car: 1991 Corvette Coupe
Engine: L98
Transmission: 700R4/4L60 same trans different name
Originally posted by five7kid
Unlike the earlier V6 cars, the later ones seem to use the same radiator as V8 cars.
yes they do

part numbers are the same
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Old Mar 27, 2003 | 08:34 PM
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From: Elizabeth NJ
so ur tellin me that every f-body has the same radiator
ok well ur not as inteligent as u think u are because look under the hood of some of the older 3rd gen fbodies the rad hose is on different sides and the #s are diff

plz do research b4 u go tell someone the wrong info
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Old Mar 27, 2003 | 10:33 PM
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Search, man, search! I think I've written a bunch on this. Unfortunately, I went through it the insane way (no donor car). It's a good idea to think over the swap. Why are you planning it? Make sure it will be worth the work. I'm not trying to talk you out of it though. It can be a great project and doesn't have to be hard. There really are so many little things though that would have made me second guess it if I had known. All in all though, I'm glad I did it. Felt good to know I'd done all that.
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Old Mar 27, 2003 | 10:58 PM
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From: Ames, IA
Car: 1989 Camaro RS
Engine: Vortec 350
Transmission: Built 700R4
Originally posted by matts90firebird
so ur tellin me that every f-body has the same radiator
ok well ur not as inteligent as u think u are because look under the hood of some of the older 3rd gen fbodies the rad hose is on different sides and the #s are diff

plz do research b4 u go tell someone the wrong info
Don't be like that. Seriously. It's obvious you misinterpreted what the man was saying.
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Old Mar 28, 2003 | 03:22 AM
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From: Northwestern Pennsylvania
Car: 1985 Pontiac Trans Am
Engine: 355 with stuffs.
Transmission: 700R4
Axle/Gears: 4.10 Posi
guys, 90-92 v6 radiators can work on V8 (I found this out by mistake lol), the older ones will not work. If your v8 has the optional oil cooler from the factory, any v6 radiator won't work, UNLESS you bypass the oil cooler, in which case, 90-92 v6 radiator will work.
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Old Mar 28, 2003 | 12:02 PM
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im dont know alot about engines, but will the oil cooler be on a older non computer 350??


what does points do?? is it when the tranny will change gears, or.......???? just curious!
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Old Apr 9, 2003 | 10:07 PM
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From: City By The Bay
Car: C230 Kompressor
Engine: 2.3L Supercharged I-4
Transmission: 5-Spd Tiptronic
Axle/Gears: 3.27
Originally posted by ionicswing

what does points do?? is it when the tranny will change gears, or.......???? just curious!
points have nothin to do with the tranny or gears... points are what were used on those older engines.... not sure what years but know that they were used in first gens and some second gens... this system was used prior to electronic ignition... (the system that sends spark to the distributor)
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Old Apr 12, 2003 | 02:30 AM
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From: Northwestern Pennsylvania
Car: 1985 Pontiac Trans Am
Engine: 355 with stuffs.
Transmission: 700R4
Axle/Gears: 4.10 Posi
Originally posted by ionicswing
im dont know alot about engines, but will the oil cooler be on a older non computer 350??
I Highly doubt the optional 3rd gen oil cooler will be on an older 350... they are easy to spot. they mount just above the oil filter mounting location, and have heater hose going in and out of it. You shouldn't have to worry about that. So what makes you want a non computer V8? A TPI swap is almost a direct fit, given the little changes you have to do (fuel pump, motor mounts, stuff like that).
Don't get me wrong either, I'm not trying to dissuade you from doing what you want to do, I was just throwing a thought out.

Last edited by Quick_Trans_Am; Apr 12, 2003 at 02:32 AM.
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Old Apr 12, 2003 | 09:06 AM
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well iv had bad luck with my computer after i got it replaced after it burnt out and cost me $700 to fix it gave me a whapping 9mpg in the city and a whapping 13 mpg on highway in my v6 3.1L
then i talked to my friend that has a 650hp camaro and he gets 16 city and 22 highway so i kinda dont like computers in cars

and you know what i mean computers are good and so are cars but they dont belong together

and having a computer is all fine and dandy if u have the $3000 scanner to hook it up too to figure out whats wrong with it but if not if just makes ur life harder

PS when my computer burnt up back then i did not know alot about cars and could not fix it myself
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Old Apr 12, 2003 | 11:08 AM
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From: Northwestern Pennsylvania
Car: 1985 Pontiac Trans Am
Engine: 355 with stuffs.
Transmission: 700R4
Axle/Gears: 4.10 Posi
matts, I know computers can be a pain, especially when an engine is running "not quite right". $700 is a total rip to have a thirdgen computer fixed, I'm not knockin you or anything, but that price is ridiculous. What went wrong with it? I'm sure you know more about it now, but I purchased a computer from the parts store (rebuilt) for about $58, of course it had a $120 core charge. I don't know, I guess it's personal choice, I like the smoothness and economy of the computer controlled V8s, plus in something like a '90, a TPI swap isn't very difficult either (I just finished mine) I was surprised at how MOST of the existing hardware worked with it, I was also surprised at all the rumors and things I had heard about that swap were untrue. Like I said, it's all in what you like, I just like my fuel injection.
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Old Apr 13, 2003 | 09:53 PM
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ah.......which one would have less probs, computer, or non computer(changeing engines)?
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Old Apr 14, 2003 | 05:05 AM
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From: heartland
Car: 89rs (previous 2.8)
Engine: 406
Transmission: 700r4 (for now)
non computer carb is the easiest...I would reccomend doing a LOT of research before taking on this project..it is NOT a swap for a beginner....do a search on v-6 to v-8 swaps, and then come back and ask any specific ??? you may have....GM used 2 styles of radiators in there v-6 cars one with the return on the left one on the right...correct Quick_Trans_Am..
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Old Apr 14, 2003 | 09:53 PM
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From: Northwestern Pennsylvania
Car: 1985 Pontiac Trans Am
Engine: 355 with stuffs.
Transmission: 700R4
Axle/Gears: 4.10 Posi
Originally posted by ionicswing
ah.......which one would have less probs, computer, or non computer(changeing engines)?
Well, if you know what you're doing, either one CAN be trouble free... The way I looked at it, My '90 was fuel injection, already set up for fuel injection, so I put in a fuel injected V8... My bro's camaro is a carb setup, so I'm putting a carb V8 in it. I just keep it simple, not that it's really hard to go from fuel injection to carb. Like I said before, either one can be done, it's all in what you like.
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