Hello all. A 3.4 intake a good swap for my 91 3.1?

[85_305]

I was just wondering what kind of performance could be had by doing this swap. How straight forward is it? Which year intake is the best to work with?
Thanks,
Matt

[Superdave]

I was just wondering what kind of performance could be had by doing this swap. How straight forward is it? Which year intake is the best to work with?
Thanks,
Matt

you mean a 3400? i hope so..


typically a 3400 top end on a 3.1 with no other mods will gain you around 30 HP if tuned right. That's with the 3400 exhaust manifolds and a good exhaust...

http://www.domesticcrew.com/hybrid.html is a great read on the subject, it's geared towards Jbodies but most of the stuff is the same...

[85_305]

typically a 3400 top end on a 3.1 with no other mods will gain you around 30 HP if tuned right....

What???? Thats news to the ears!!

So lets get this straight. 3400 intake manifold, 3400 exhaust manifold, and that's it? What kind of work must be done in order to get these to fit my 3.1? Thanks for the link btw.

[sil]

if you have a 3.1(not 3100) then you need to do heads lower intake manifold upper intake manifold exhaust manifolds just to name a few parrts

or you could do a 3500 heads, lim, uim(or 3400 uim)

prolly need custom pushrods ont he swap(i needed em)

[Superdave]

What???? Thats news to the ears!!

So lets get this straight. 3400 intake manifold, 3400 exhaust manifold, and that's it? What kind of work must be done in order to get these to fit my 3.1? Thanks for the link btw.

you need the heads, lower intake manifold, plenum, exhaust manifolds, fuel rail/injectors and the throttle body. Possibly the timing cover if you like power steering.

[IsaacHayes]

sil, a 3500 head is too big to match up with the 3.1 bore. 3500 heads swap to a 3400 block though..

[85_305]

Aw man this is too in-depth. Last time I ripped apart an engine this bad was my Z28 a few years ago. Will a 3100 v6 bolt up in place of my 3.1?

[sil]

sil, a 3500 head is too big to match up with the 3.1 bore. 3500 heads swap to a 3400 block though..

damn that sucks, thanks for the info

[Superdave]

Aw man this is too in-depth. Last time I ripped apart an engine this bad was my Z28 a few years ago. Will a 3100 v6 bolt up in place of my 3.1?

Should... you may have to get creative depending on your mounts.

us Cavalier guys just have to make 1 custom mount and the 3100/3400 bolts right in with the rest of the stock mounts.

[85_305]

Well then you Cavvie guys just suck dontcha But cool. If I run across a 3100 I might just pick it up then. Thanks man!


EDIT: Just so we're on the same page, the tranny will bolt up and all the accesories will fit right?

[Superdave]

Well then you Cavvie guys just suck dontcha But cool. If I run across a 3100 I might just pick it up then. Thanks man!


EDIT: Just so we're on the same page, the tranny will bolt up and all the accesories will fit right?

Yep!

you'll have to swap over a few things like the alternator bracket but that's cake.

i have an '89 2.8L alternator bracket and lift brackets on my 2004 3500 also a '91 Oil pressure sensor, '91 knock sensor, 93 transmition and other misc stuff.

[85_305]

Wow that's pretty neat. I figure the performance difference between my '91 3.1 and a '98 3100 is pretty damn high, so I might just start there then start my modding bug up again
BTW.. how the WTF are you getting 300hp and 300 lb's of torque from a 3500???

[Superdave]

Wow that's pretty neat. I figure the performance difference between my '91 3.1 and a '98 3100 is pretty damn high, so I might just start there then start my modding bug up again
BTW.. how the WTF are you getting 300hp and 300 lb's of torque from a 3500???

If you want a 3100 then go for a year 2000+ one. The large port stuff is way better... or just a 3400.. mounting is the same.

most of my engine work can be seen here: http://www.v6z24.com/jbodyforum/viewtopic.php?t=90913

[85_305]

Nice and writeup What hp/tq do 2000+ 3100's produce? Probably a LOT lol. Those will probably be more expensive, but I will have a look around

[IsaacHayes]

a GP has front dog bone mounts and I don't know about the other moutns but the front ones should fit fine. if it doesn't then perhaps get one from a later yaer GP that had the 3100 in it.

Yeah go for 3400 or if 3100 get 2000+. But 3400 for .3l more is better
3400 ~185, 2000+3100 ~175, 94-99 3100 ~155hp.