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3x00 Specifics Comprehensive Coverage of the 3x00 Hybrid Motor

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Old 02-21-2014, 06:17 AM
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Default 3400 Swap

Well I said I was going to make this for a while now, but I have the motivation to do it. This is a 3400 specific guide, and there are some differences if you use a 3500. I'm not sure if a 3100 would be any different. Its not that bad of a project if you've done a swap before. I'll start with the needs.

From a 3400
- Engine La1 preferably a 99 up one.
- Starter
- Coil pack bracket
- Thermostat housing
- Injector harness
- Throttle cable from a 3400 W-body or anyone that will reach.

From a 3.4
- All accessories
- All accessory brackets
- Timing cover
- Knock sensor on the block
- Flexplate if auto
- Engine wiring harness
- Injector harness connector
- Headers
- Crank pulley

If using a 3500 its not much different, but the engine has to be a 05 or 06 engine. Has to be a LX9.

Once you have your engine it will probably look like this:


First thing needed is to strip all the accessories off, timing cover goes, exhaust manifolds go, and the only part that you need to keep is the injector harness. Probably will end up with something like this.



Next thing your gonna do is flip the intakes and valve covers.


The lower intake thermostat housing has a coolant line that comes out of it that needs to be tapped and have a fitting insert for the other coolant temp sending unit that the 3400s don't have.


The timing cover is next.

First thing that needs work on the timing cover from a 3.4 as it sits it will not bolt up to the engine since the ear at the top will hit the thermostat housing. This is easily fixed with a grinder.





Next up is the plug that needs to be put in it or it will pour coolant out quite badly.


The hole there in the back of the cover goes to nothing on the 3400 block, so it needs to be plugged.


Should look like that then.

Lastly you will need to drill out three of the bolts holes on the cover and the water pump to bolt up to block. The bolts you will need are m12 x 80.


Those holes also need to be enlarged on the water pump.

After that the timing cover is finished. The other accessory brackets are pretty easy compared to that. The passenger side bracket just needs a bolt hole opened up to bolt to the heads.

I don't have a picture of it at the moment, but its the one that bolts to the far side of the head. GM was even kind enough to outline it for you. Almost like they meant to do this engine in the car.

The power steering bracket takes a bit more work. Its gonna need some trimming to work on the engine. I don't have any before pictures of it, but I'll dig out my spare sometime when the winter apocalypse is over and take a picture.




With that all the accessory brackets should bolt up.

The only thing that needs to be done to bolt up the accessories is that the alternator needs to be ground down on the corner until it doesn't hit the valve cover. Now you can move onto the wiring.

The hardest part of the wiring is the injector harness. The 3400 injector harness has a different connector from the 3.4 one. You will need to cut and splice it to 3400 harness. My brother took care of this while I was work the one night so I don't have pictures of the process. Not all that hard though.



The rest is just extending wires to reach the places on the 3400. Ones I remember off the top of my head are knock sensor, starter wiring, low oil level sensor, coolant temp sensor, Iat, a couple grounds, and the map sensor if I remember right. That should be all for the wiring. Next up is the rest of the work needed to get the engine in.

Not much getting around it the 3.4 motor mounts will not bolt up in the same way as they did on the 3.4. You got a couple choices you can either make new ones or modify the old ones. Really don't have a choice on the 3500 since the intake will hit the cowl unless the engine is lowered. I modified the old mounts. Passenger side was easy just move the mount back a bit and it bolts to other holes on the 3400. The driver side is very different. You have to make an adpater so it will work. I don't have pictures of either at the moment, but its not complicated.


Passenger side on a 3.4


Drivers side on a 3.4. Just for giggles the oil filter housing will not work with the 3400.


Passenger side on the 3400


Drivers side of the 3400.

With that taken care of it should go onto the subframe, but you should put the headers on it first The headers will not bolt up to the heads as they come. You will need to cut the holes to the end of the flange to line then up with the holes on the heads. Y pipe needs to be made for the drivers side as the oil pan blocks the way it would normally go. The egr also gets removed. Last thing that needs to be done it to bolt up the flexplate from the 3.4. After that it should be ready to go in the car.

The trans and torque converter will now bolt up to the engine. Only difference with the trans is that one of the bolts holes on the 3400 blocks is a through hole, so you will need a bolt and nut for it.


The dust cover will need to be trimmed to fit the starter now that its on the other side. You may be able to use a 3.8s cover, but I didn't try.

That should get it in the car. Now you need to the replace the throttle cable with a longer 3400 style one from a W-body. If you want the cruise control to work then pick up a 3.8 F-body cruise cable. Again no pictures

The last couple things needed is coolant line and fuel line mods. The one heater core line will bolt up no problem the other needs to be shortened and clamped onto the back of the intake line which is a pain to do. The upper radiator hose needs to be longer to reach the thermostat housing. The fuel line connectors on the 3400 rails are female ends and the lines on the body are also female. I'm gonna change my setup eventually, but I just cut the ends off the 3.4 rail and clamped them into the 3400 rail.

After all of that it should run and drive.



I guess there needs to be an explanation on why this is a good idea.

Pros
- 3400 makes 180hp and 210 ftlbs
- 3500 makes 200hp and 220 ftlbs
- both respond better to mods
- 340lbs vs 410lbs
- heads with much more potential
- stronger bottom ends than rwd 3.4s
- better powerband
- much better fuel economy easy to get 30+
- 3.4 cars are cheap to buy
- cheaper to tune than a 3.8

Cons
- lots of work
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Old 02-21-2014, 09:56 AM
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This is a very nice write up! Glad someone finally posted some stuff about it.
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Old 02-21-2014, 10:35 AM
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It still needs a bit of work. It took a while to type that so I skipped on some details. I'll work on it more then.
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Old 02-21-2014, 12:19 PM
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Awesome write up man! Gives me inspiration to see it all done!
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Old 02-21-2014, 12:53 PM
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Nice thing is a lot of it you can ignore. You don't have to drill out the timing cover or plug it, no exhaust pipe issues, or motor mounts either.
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Old 02-21-2014, 10:16 PM
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Not as extensive in that sense, still a lot in terms of decision making and tuning haha. Can't decide what cam or anything, but it's nice to see how the top end would look in the engine bay :p
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Old 05-07-2014, 11:35 PM
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Hey Kyle, great thread man! You've probably heard there's a newbie on the forum asking questions (some stupid ones I'm sure)... well that guy is me, Jason. I was directed to post in this thread through very helpful members of the forum. You definitely deserve props on the write up & pics, great job! I have a couple of questions for you as I have a 95 3.4L RWD Camaro (all stock/base), that I am going to change up. The engine has a blown head gasket(go figure, lol)... cylinder walls, crankshaft, etc, block is in great condition. Cam is done & needs replaced, was gonna do it anyways. So here goes, 2000 Pontiac Grand Am motor is on the way, $400 + shipping, looks to be in great shape but don't know the mileage. Gonna tear it apart anyways to replace gaskets, oil pump, check for wear & tear, etc. To my 1st question, flex plate vs. flywheel. Since I have a 95 manual T-5 tranny will my stock "weight balanced flywheel" cause damage on 2000 3400 engine that was only used with automatic transmissions (weight balanced flex plate for the application). Good to be here, would rather just throw the 3400 engine in so I don't have to deal with the top end swap crap when it comes to custom pushrods, etc, etc. But I have the parts to go either way, top end swap or complete engine. Thanks for listening!
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Old 05-07-2014, 11:53 PM
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Please let me know if I was ambiguous in my question... Obviously I need to use the flywheel for the T-5 manual tranny... just unsure if the balance of it differs from the balance of a 3400 flex plate, if that makes sense. I got questions #2 & 3 lined up after this one is answered... Other forum members please feel free to chime in, that's why we're all here, right?
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Old 05-08-2014, 12:04 AM
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Sorry for the repeat posts guys, thought I figured out how to stop that crap... once again, Newbie/rookie, should just make that my signature.
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Old 05-08-2014, 08:58 AM
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i fixed you double posts.

The t5 flywheel in a 3.8 is so much heavier than the auto flexplate. i don't believe it matters.
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