Not sure

[96gagt4door]

Hey all not sure if this is the right section or not, iv also done a search...

Iv got a 3100 in my 96GAGT and i wanna swap that out with a 3400 that im planning on doing some work too IE...ported upper and lower intakes, cams, pcm upgrade.... question is would a 97 3400 outta a venture work? also im planning on using the pcm from the 3100 but the upgrade is for a 3400.... should i switch out the computers while im at it? AND i know some of the 3400s have the engine mounts on the front of the engine and the 3100 i have has the mount on the passenger side does it make a difference...

thanks for you help guys

[Mystic_Cowboy]

http://www.3400swap.com/ says that these cars 3400's will work

1999-2004 Pontiac Grand Am
1999-2004 Olds Alero
1999-2004 Chevy Venture
1999-2004 Pontiac Montana
2001-2004 Pontiac Aztek
1999-2004 Olds Silhouette
2002-2004 Buick Rendezvous
2000-2004 Monte Carlo
2000-2004 Impala
1996-1998 Olds Silhouette
1996-1998 Pontiac Trans Sport/Montana
1996-1998 Chevy Lumina APV/Venture


3400 swap also says to keep the 3100 PCM

any other questions will probably be in the guide, but I don't know the answers to them

[lvemy3100]

I'm gonna have to say that you would find tuning much easier if you have a 97 or better still a 98 PCM...

Just cause it will run with the old 3100 PCM does NOT mean it is even close to correct for the application...

[99GrandAMSE]

... it would make sense to me to have the computer specific for the enginebut what do I know ;) :lol:

[98GTKid]

I'm not hating on ya, and in fact if you want to do it go ahead..
But. . swapping a 3400 for a 3100 seems pointless. Sure maybe 10-15HP more but now you've got an engine that didn't come in the car. If you want to mod it, clearance is going to be different than in a 99+.

Also, I think the engines would be relatively comparable power wise if their modified..

Just my opinion though.

[96gagt4door]

I'm not hating on ya, and in fact if you want to do it go ahead..
But. . swapping a 3400 for a 3100 seems pointless. Sure maybe 10-15HP more but now you've got an engine that didn't come in the car. If you want to mod it, clearance is going to be different than in a 99+.

Also, I think the engines would be relatively comparable power wise if their modified..

Just my opinion though.

YEAH I KNOW BUT THE 3100 I HAVE IS WAY TOO SLOW... IM DOING A BUNCH OF STUFF TO IT WITH NO SUPERCHARGER..


ALSO THANKS FOR THE INFO GUYS REALLY APPRICIATE IT....

[bandit307]

I'm not hating on ya, and in fact if you want to do it go ahead..
But. . swapping a 3400 for a 3100 seems pointless. Sure maybe 10-15HP more but now you've got an engine that didn't come in the car. If you want to mod it, clearance is going to be different than in a 99+.

Also, I think the engines would be relatively comparable power wise if their modified..

Just my opinion though.

A 3400 swap is actually well worth while, if you pick up a low mile engine for decently cheap then why not? You will notice a significant difference between the two engines, along with the 3400 has more aftermarket support. Such as going bigger 3500 top end, along with bigger displacement. I was once naive of the swap, saying that its not worth the price. But do the research and you find its well worth it.

[Big Joe]

I'm not hating on ya, and in fact if you want to do it go ahead..
But. . swapping a 3400 for a 3100 seems pointless. Sure maybe 10-15HP more but now you've got an engine that didn't come in the car. If you want to mod it, clearance is going to be different than in a 99+.

Also, I think the engines would be relatively comparable power wise if their modified..

Just my opinion though.


Sorry but you couldn't be more wrong. The 3100 and 3400 are basically the same engine. They use most of the same(or close to the same) parts right down to the engine mounts. Your not going to have any clearance issue's either. Lots of people have done this swap with huge success.

[98GTKid]

So how exactly am I wrong? You pretty much said what I said.. The 3100 and the 3400 are basically the same engine.

I can see that there are slight ( but not that significant gains) and if you were to say put a CAI on it made for a 1999 grand am, your going to need to mod it cuz I cant see it fitting a 3400 in a 98. Even if the engine is the same size exterior wise. Thats all i'm trying to get at.

I don't want to start a flame war ... but tonight for example. Stock for stock my 3100 vs. a 3400 99+ were dead locked.
The extra hp plus lower weight would make sense if you have the money but really thats the only advantage I can see.


What I forgot to include--
Build up the 3100 with 3400 parts.
There we go! I remembered this time.

[Big Joe]

So how exactly am I wrong? You pretty much said what I said.. The 3100 and the 3400 are basically the same engine.

I can see that there are slight ( but not that significant gains) and if you were to say put a CAI on it made for a 1999 grand am, your going to need to mod it cuz I cant see it fitting a 3400 in a 98. Even if the engine is the same size exterior wise. Thats all i'm trying to get at.

I don't want to start a flame war ... but tonight for example. Stock for stock my 3100 vs. a 3400 99+ were dead locked.
The extra hp plus lower weight would make sense if you have the money but really thats the only advantage I can see.


What I forgot to include--
Build up the 3100 with 3400 parts.
There we go! I remembered this time.

I meant basically the same in dimensions and fitment. And why would you put a CAI made for a 99+ on a 98? A CAI from a 98 would work with no modification at all for the 3400 and would obviously already fit the car just fine. You were in a dead lock with the 99+ for a reason. 94-98's with 3100's weight significantly less then a 99+ with a 3400. (few hundred pounds) You can find low mileage 3400 for 400-600 bucks and if you do all the work yourself then your getting everything for well under a $1000. So you have an engine with more horse power and more potential for well under a grand and you don't think thats worth it? Not to mention the fact that the newer engine will be way more reliable.

You can build up your 3100 with 3400 top end parts but in the end you still have a 3100, only with better air flow, so a stock 3400 would still be better then your modified 3100.

[96gagt4door]

You can build up your 3100 with 3400 top end parts but in the end you still have a 3100, only with better air flow, so a stock 3400 would still be better then your modified 3100.

thanks big joe thats what i was thinking when i decided id do the swap, my only problem is finding tthe low milage 3400 here where i live for under $1000

[Trudgn]

Why is the swap worth it?

PB with 3100 - 16.71 @ 82
PB with 3400 - 15.71 @ 86

It made me fall in love with my GA again, the power increase was VERY noticable, and everything still looks stock. Not to mention all the upgrades that are completely compatible with the 3400.

[Big Joe]

thanks big joe thats what i was thinking when i decided id do the swap, my only problem is finding the low milage 3400 here where i live for under $1000

I've seen plenty of 3400's for well under a $1000 Even seen a few under $500. Check on ebay there always on there and usually for a decent price. In fact I think there was someone on here selling a 3400 for pretty cheap. Don't think he ever sold it, you should search the classified section.

[Korbendallas68]

I really recommend you read the guide over. Answers a bunch of questions.
Also...

www.car-part.com is the BEST.

Keep the ECU for the 3100 The 3400 will not work with older cars.

I'm gonna have to say that you would find tuning much easier if you have a 97 or better still a 98 PCM...

Just cause it will run with the old 3100 PCM does NOT mean it is even close to correct for the application...

That's partially true about the 3100 PCM. If you want the 3400 to run at it's peak, it would be a good idea to tune it for the larger displacement. I have no experience with this, though I assume it's do-able with the proper PCM tools. You'd want a OBDII or older flash type OBDI system. There is people have have done the conversions to both types, I'm sure you could find it on some other forums.


You will notice the larger displacement from the 3400.

And it's a hellva fun time swapping out the motors! It's a fun learning experience.

http://memimage.cardomain.net/member_images/11/web/359000-359999/359422_1_full.jpg

[96gagt4door]

I've seen plenty of 3400's for well under a $1000 Even seen a few under $500. Check on ebay there always on there and usually for a decent price. In fact I think there was someone on here selling a 3400 for pretty cheap. Don't think he ever sold it, you should search the classified section.


yeah im sure there are but it doesnt really make alot of sense to ship in a motor from the us when i live in canada... iv got a guy at work looking for a wrecked grand am or somthing newer then a 97 so we shall see worst case for me is i get 1 from the us...

[Nighthawk243]

Although "15" extra horses may not seem worth it, there is a noticable difference though. The G5 2.2L is a dog compared to the one with the 2.4L VVT.

[98GTKid]

Like I said i'm by no means trashing your idea. Go for it. If you have the hookup on an engine and trust the milage on it, do it. In fact, I'd probably do that swap too.


Now a 3400 in a 98' vs. a 3400 in a 99+..the 98's gonna win.

Do you happen to know the approx. weight of the two engines Joe?
Just curious to see the numbers because the body of the 99+'s are a lot broader and have just got to be quite a bit heavier than the earlier models.

My friend parks her 2002 next to my 1998 sometimes and she even said 'your car looks like a miniature version of mine!"

Sorry if it's a tad off topic. . just curious is all. I'm here to learn! :P

[bandit307]

1992-1998
HP - 160
TQ - 185
Curb weight (lbs)
Coupe - 2881
Sedan - 2954

1999 - 2005
HP - 175
TQ - 205
Curb Weight (lbs)
Coupe - 3066
Sedan - 3116

[Big Joe]

1992-1998
HP - 160
TQ - 185
Curb weight (lbs)
Coupe - 2881
Sedan - 2954

1999 - 2005
HP - 175
TQ - 205
Curb Weight (lbs)
Coupe - 3066
Sedan - 3116

Not sure where you got the ratings from but 3100's were rated at 155hp. I'm almost positive.

[bandit307]

Not sure where you got the ratings from but 3100's were rated at 155hp. I'm almost positive.

Your right Joe, the 3.3 is 160hp. my mistake.

[Big Joe]

Your right Joe, the 3.3 is 160hp. my mistake.


:thumbup: