This is what I think so far tell me if I am going the right way. Right now I have a 94 v6 3.4 auto...

Im getting the lt1 in the next couple of weeks . Its coming the the automatic transmission and ecm , wire harness , in another words it comes complete. Im also going to buy the front springs , aluminum driveshaft , rear posi axel,

Do I need to buy the radiator?

Im also buying some performance parts like a cam , im gonig to get the heads ported, cai, exhaust ...

Im I heading the right direccion?

Ruben
Thanks in Advance...

 

i did this on my car
same thing, but mine was a 95 3.4 and i went to a 95 z28 drivetrian
you'll need a trans
you'll need a front K-member becasue the motor mount holes are different
springs and shocks all around
there are two wiring harnesses in the engine bay one comes from the PCM and stay close to the firewall, this one is easy to see and im sure you have it, but there is another large harness that goes around the front of the bay from the PCM forward and under the radiator support and back up the other side, this not only has your headlights/airbags/washerpump, but your number 7 and 8 injector power wires in it along with both engine bay and cockpit fuse boxes are on this harness (i found this out the hard way) also you'll need v8 gauges
you'll also need a tourqe arm, the v6 driveshaft is 2 piece and is actually mounthd to the touqe arm, the v8 arm doesnt have this

i think thats it, if you have any questions feel free to PM me
also i found this site pretty helpful
http://www.hpsalvage.com/
i was on the phone with them alot when i was doing my swap

of also you will need a radiator and cooling fans
v8 has 2 v6 has one
and if your going with the discs in the back i would upgrade your entire brake system (minus the lines) this may not be neccesary but discs are not drums so the booster is different
also the fuel pump is a MUST the car will never run right with the v6 pump in

 

The torque arm is the same for both cars.
You dont need to touch the rear shocks, springs, nor the fronts however you do need to get a K member from an LT1 car.
You could even use your V6 driveshaft if you really really wanted to.

I'm quite sure the radiator is the same, however you are going to need the correct hoses, and dual fans, I believe the heater lines are also going to be different.

I'm quite sure the engine bay wiring is the same you'd just need to plug an engine harness from the same year car in, however I dont have one from a V6 car here at the shop right now to check it out.

 

im sorry i was telling him how to do it the right way

ok dont touch your front shocks
the k-member will scrape everything you drive over
dont touch the rear shocks, good luck getting correct traction at launch
dont change the radiator? ok well the v-8 has a higher coolant capacity
dont feel like changing the tourqe arm?
well your v8 driveshaft will hit the mount that is on it for the 6 banger driveshaft
want to use the 6'r's drive shaft?
thats cool becasue its going to snap in two at the joint before you get to 3500 rpms
and i seriously hope you change the engine bay wiring or else there is no point doing a swap becasue two of your injector control wires are in one of the harness on the passenger shock tower, if you look on the 6 there is only one plug there, on the 8 there is two and this is connected to the entire harness
so if you want to mickey mouse it, go ahead but i seriously doubt it will work
i have made these mistakes already so i knwo how to do this

 

Here's my take on it, sell the V6 for what it is worth, then go out and just buy a Z28, you will save A LOT MORE MONEY!!!

why buy a v6 in the first place???

 

this is true, if i wasnt looking for a project when i did mine i would have bought one, you can get a 95 z28 nowadays for under 5 grand
but i had alot of fun doing my motor and now i have alot more pride in the car plus i still pay v6 insurance

 

I dont sell my v6 cuz the body/interior is in perfect condition. Motor is in bad condition.. If i sell it im not gonna get ****... Plus I prefer fixing the car up my self changing all those parts and knowing what I have. Money isnt the prob. Ill probably just buy a wrecked z28 of an auction.. I got a friend with dealer license. he says they sell pretty cheap...

Thanks to you guys that support this.....

Ruben

 

The shocks are the same, your information is incorrect, dont get pissy because you posted the wrong info, the springs are going to be the difference, the torque arm is just the same, i've pulled enough of them apart to know, yeah the driveshaft is gonna hit that small spot thats welded on when the 2 piece driveshaft is bigger in that area riiiiight. Yes now that you mention it the V6 radiator does use a thinner core, thus why i said "i dont remember right now " Not to mention you are funny with "good luck getting traction" if you dont change to V8 rear stuff, cause 1 the shocks are the same which you swear are so imperitive to change, and 2 if you did a little research you'd find in the past a lot of drag guys running V6 springs to get better launch traction at the track.

 

i didnt mean to sound pissy, i was at work and its not exactly the happiest environtment
but anyway
i ran v6 shocks and springs in my rear and could nto hook for the life of me, i threw the v8 shocks and springs in and it worked fine, i did my research about the springs and ran my v6 springs in the back with zero difference in 1/4 times so i put the v8 springs in because they where on the v8 car for a reason, the v8 springs have a different part number from GM and are therefore a different part, when i put my v8 shocks on it fixed my traction problem
i think maybe im just a firm believer that the factory knows what they are doing when they design a car so i try to keep the parts that they design to work together together, if that makes any sense and just like you forgot about the radiator i forgot the the bracket that holds the two piece driveshaft was connected to the driveshaft and unbolts from the tourqe arm


but anyway i think between the two of us in our little debate we have given him enough info lol
also the wiring harness that runs over the passenger side shock tower and around the front of the engine bay, how did you do a swap without replacing this i didnt replace it when i did mine and only ran on 6 cylinders until i did because it has the power wires for 2 of the injectors in it

 

I am just finishing this transformation (3.4 - 5.7 A4- M6), It was so much fun. It was my first real car project(only 20 now, 18 when we started(dad and i). I had so much fun and I learned so much! I wouldent trade that project for anything. If you have any little questions ( i.e. where does this plug go) IM me at dastrikatank, i spent a lot of time on the wires, and everything else.

 

The springs I am sure are a different part as you said, and I already admitted, however the shocks are the same thing, the only likely reason your performance improved when you swapped in "V8 shocks" which are the exact same things, is that your old shocks were simply worn out.

I havent done any swaps on 4th gens, however I have stripped a lot of them, and done several LT1 thirdgen swaps, thus why I said "im not sure but i'd bet the wiring is the same" its still possible they use the same harnesses, since 94 and 95 harnesses were different, is it possible you used a different year engine harness than your car ?

 

no i searched for a very long time to find a wrecked car the same year as mine jsut for ease of swap and plus mine was a 95 body and i knew i wanted a 95 motor because they had hardend pushrods from the factory
the shocks may look the same but they have a different GM part number so i really cannot fathom why they would give identical parts different part numbers, i could be wrong but its not like i got that info online either, i got it out of the factory GM replacement catalog at the shop i worked at. and in the millions of parts i must have looked up i never saw the same part with two different part numbers

 

im 80% done with my swap.

i went from a 3.4 to a 96 "obd1" ta.

Big things to consider:
its a great time to install headers. much easier to go in.

radiator IS different. There is one more inlet, i think for the tranny, and all in all its different.

springs and shocks are different. their spring rate is higher than the v6.

ac lines are the same, for the most part.

dash harness/engine harness/relay harness must be of the same year car, and they must respond properly to the computer. ie. obd1 with obd2 wont work.

 

Just buy a z with blown head gaskets or something you can pick em up for like 2 grand, i bought mine hit in the front for $1500 needed a front clip ($800) water pump($200) and a few minor things basically I had a stock z28 for under 3 grand

 

I never heard of that forward Harness difference before (2 injector wires missing), it does however sound plausible.
The problem is that NOBODY so far took the time to do a 3.4 - LT1 conversion and document it properly step by step.
If you look at all the different opinions and approaches by several people you see that there are MANY differences.

Never heard of that harness swap though, and several claim that they had to do minimal wiring adaptions.