Swap info from:
http://www.v6z24.com/howto/3400/intro
http://www.v6z24.com/howto/3400/parts
Chapter 1: Introduction / Why should I swap?
3400 V6 In this chapter we will help you to understand what exactly you're getting yourself in to. After reading this you should be able to make an educated decision as to whether this swap is right for you and have a good idea of the benefits & pitfalls of performing this engine swap
What is the 3400 & why it is better than your current motor?
Then 3400 is one of GM's 3rd generation 60°V6 motors. The engines used in our 2nd generation J-Bodies is the gen 2 version of the 60° V6. The Gen 3 motors show significant improvement over the gen 2 variations in power & fuel efficiency. The 3100 is also a gen 3 motor and depending on year, is nearly identical to the 3400, save for the bore.
GM rates the 3400 V6 at around 185 crank horsepower depending on application. All the motors are the same between applications (2005 Equinox being the exception, you can't use that motor, more on that later). The only reason they are rated at different horsepowers between models is because of the differences in intake exhaust & tuning on that particular model. There are several dyno results that prove a stock 3400 in a J-body will make 180-190 HP at the WHEELS. So GM has either under rated or under tuned these motors in their vehicles.
So this means you are looking at approximately 210 HP at the flywheel. Quite an improvement over the 140 HP your tired 3.1 is rated at, or the 130 of your 2.8. You will shave at least 1 full second off your quarter mile time, with basically stock 3400 swapped cavaliers running as fast as 14.5 seconds at 93mph through the 1320! If that isn't enough reason to do this swap, I don't know what is!
Where to get your 3400 Engine
The junkyard!
www.car-part.com is your friend for locating your new motor. But first you need to know what to search for.
The 3400 V6 Can be found in the following GM models.
•Buick Rendezvous
•Chevy Monte Carlo
•Chevy Lumina APV
•Chevy Venture
•Olds Alero
•Olds Silhouette
•Pontiac Aztec
•Pontiac Grand Am
•Pontiac Trans Sport
The 3400 became available as early as 1996 in the trucks, 1999 in the cars. It is generally advisable to get an engine from a 2000+ model year if possible due to some beneficial design changes. Engines before 2003 were very susceptible to a leaking Lower Intake Manifold. If you get one of these motors no matter what the mileage, plan to replace the LIM before installing the engine to save yourself the headache & possibility of ruining the engine.
What to look for in a 3400 & what you will spend
Expect to pay anywhere from $300 - $800 for a 3400 depending on your area & the mileage of the motor. I picked up my 2001 engine with 6k on it for $600. Many junkyards will deliver the engine to your door.
I would look for 2000+ model year engine with less than 50,000 miles on it. Make sure the junkyard has some sort of warrantee in case the engine is blown.
If you are swapping into a 92-94 J-body, it is even better if you get the motor from a Grand Am, as those engine have the proper fuel line routing that will plug right in to your quick connect fittings. <91 J-Bodies don't have the quick connects, so it doesn't matter. You don't HAVE to use the Grand Am fuel lines to make it work, it just makes it that much cleaner & easier.
How hard is this swap & how long will it take me?
If you have decent mechanical skills, this swap is pretty straight forward. I would not recommend it for a complete novice unless you have somebody more experienced to help out. You'll need a full set of basic mechanics tools, engine hoist, jacks & jack stands. If you have ever pulled an engine before, this swap will be no problem for you, as it is basically just an R&R with a few extra modifications.
This swap can go as quick or be as drawn out as your want. I would plan on having the car down for at least 2 weeks, but could easily take up to a month to get all the little bugs worked out. If you have a lot of time to devote to the project, you could probably get it all hammered out in less than a week, but don't try to rush things & make mistakes. If you have your 3400 all prepped & ready to go and are really determined, you could probably complete the swap in a weekend, but still plan on extra time for working out little bugs.
The basic changes required to make this engine work in the J-body
There are a few somewhat major modifications that must take place & many small ones. Here are the major items & considerations. •Custom front motor mount bracket must be made or purchased. J-body performance sells this mount, or if you have fabrication skills, you can easily make your own.
•A custom downpipe will need to be made. Pretty much any muffler shop can do this for you.
•The computer. You can run this motor on the stock tuning by swapping in your old injectors. It will run, but not optimally. The best option is to use the 2000+ 3400 multec 2 injectors and purchase a custom tuned chip. Burn is currently selling chips for this setup.
•All other changes are minor, such as moving the wiring for a few sensors, a few different lines & hoses, etc. All this is listed in the parts list chapter
Things you DON'T need to change
•Your stock V6 transmission will bolt up to the 3400 with no modifications. Just use the clutch (performance clutch recommended) and flywheel from the old motor. If you have an automatic, you will need to use a Quad 4 throttle box in order for the kickdown cable to function
•A complete computer & wiring swap is not necessary. All the 3400 engines run OBD2 from the factory. But in our swap, we will re-use the our wiring harness and computer with some slight modifications.
Why you should choose the 3400 over other possible engine swaps
The 3400 swap has proven itself time & time again as a simple swap with noticeable gains in power & efficiency. the 3800 SC swap is another swap that many people consider. That engine is a 90° engine that is a MUCH tighter fit into the J-body engine bay. Many more modifications & headaches are needed to make that swap work, for not much more power over the 3400.
3400 Engine Swap
Chapter 2: What parts am I going to need & what will this cost me?
This chapter lists the majority of the parts you will need to perform the 3400 swap. There are variations between Jbody years & engine years that may affect this parts list. All know possibilities are listed below.
1) The Engine!
Of course you'll need a 3400 engine to perform this swap.
www.car-part.com is your friend for locating your new motor.
The Intro page contains more info on locating an engine & what to look for.
2) Front Engine mount bracket
The block casting on the 3400 is different than on the 2.8/3.1 motors, so a custom bracket from the engine to the front mount must be fabricated. jbodyperformance.com sells the bracket, or if you have decent fabrication skills, you can weld up your own.
Mount Bracket Mount Bracket Mount Bracket Mount Bracket Mount Bracket Mount Bracket Mount Bracket Mount Bracket
3) Upper radiator hose
Since the thermostat outlet on the 3400 points out at a different angle, you will need to replace this Upper hose with a Lower hose from a '99 Pontiac Montana. The only modification to make this hose work is cutting it to length.
Summit Part #: GTR-61720
Autozone Part #: M-595
Montana Radiator Hose
4) Power Steering Pump
You need to get a power steering pump from a 3100/3400 motor. You cannot use your old PS pump because of the changes to the timing cover. Your best bet is to snag one from the junkyard if your motor didn't come with one. If you motor came with one, just make sure it doesn't have the Electronically Variable Output (EVO). Basically, if it has an electrical connector on it, you cannot use it!
5) Power steering line
The hard power steering line with the bends that works the best comes from a '94 Grand Am 3100. This is the full hard steel pressure line, not the line with the hose on it.
Powercraft part #80224
PS Line PS Line
6) Throttle cable & bracket
The throttle cable bolts up to the throttle body on the opposite side, so you need a new throttle cable. The best cable found to work is one from a '95 Beretta or Corsica.
If your engine came from a truck or van, then you need to get the throttle cable bracket that bolts on top of the TB from a CAR.
Throttle Cable Throttle Cable Bracket Throttle Cable Bracket Throttle Cable Bracket
7) 3 wire coolant temp sensor
The gen2 motor uses 2 coolant temp sensors. A single wire sensor on the rear head & a 2 wire sensor by the thermostat housing. The gen3 motor only has one sensor, so you will need to purchase a 3 wire sensor so that both the ECM & temperature gauge received output from one sensor.
GM/Delco Part # 10096181
Temp Sensor
8) Other coolant hoses
A package of bulk 5/8" heater hose should take care of everything else. A better solution is to grab the hard steal lines from a 3100 Beretta as they route down right by the heater core so everything will be more like stock. One of these lines requires a cut & weld to work properly however.
9) EGR considerations
If you have a 2000+ motor, you can adapt your EGR to work real easily. If you have a <=1999 engine, you'll need to purchase an adapter from the 60°V6 store.
10) Alternator considerations
You need to re-use your stock alternator. Use the gen3 alternator causes clearance problems with the blower motor
11) Downpipe
You'll need to have a custom downpipe fabricated off of the rear exhaust manifold. The downpipe in the cars these motors came out of comes off at the wrong angle and will hit the firewall.
The O2 sensor is also subject to hitting on the tierod ends, so re-locating the O2 sensor to the downpipe is advisable.
Downpipe Downpipe
12) Other Misc items
•If you don't have the Alero fuel lines, or you don't have a 92-94 J-body, you will need 2 brass compression fittings to modify your fuel lines. 5/16" & 3/8".
•If you have a 5 speed, you should probably upgrade the clutch. The stock clutch won't hold the extra power for long
•If you have an automatic, you need the throttle box from a quad 4 motor to setup the kickdown cable for the auto trans
•Other misc items...
3400 Swap Shopping List
Take this list with you to make sure you get everything you need
1.Front Mount Bracket - Build or purchase from jbodyperformance
2.Radiator Hose - Summit Part # GTR-61720, Autozone Part # M-595
3.Power steering hard line - Powercraft part #80224
4.Throttle cable from '95 Beretta/Corsica
5.3 wire temp sensor - GM/Delco Part # 10096181
6.Bulk 5/8" heater hose
7.5/16" & 3/8" compression fittings for fuel lines, if necessary
8.Performance clutch if 5 speed
9.Quad 4 throttle box if automatic
The 3400 is definitely the best bang-for-your-buck engine swap available at this point in time.