This time they are 3400 and 3500 tops. The 3400 stuff is the dirty ones .

 

What did they put the 3400sfi intake on. And where did you find that ribbed intake? I like.

 

Thos intkes will fit the 3100 and up FWD intakes. The ribbed one is from the 3500. It is a runnerless plenum (much like Dave's manifold), but won't bolt to the 3.1/2.8 stuff (note the spacing between ports).

 

I NEED TO GET ONE OF THOSE! What did they put the 3500 in? Will the 3500 intake fit the 3100 Gen I/II heads?

 

the 3500 is in most of the cars the FWD 3800 used to be in, and the epsilon bodied cars. (malibu, G6, Aura..) Impala, ect... should be the same as the 3100 and 3400 FWD engines, but not our 3.1/3.4 engines (note that the CC was never used in the RWD applications...)

 

2004 intro for the 3500. Malibu is what mine came out of.

Yes they will fit gen2 LIM's.

 

I think you are meaning to say that they fit both both 3100 large port and 3400 gen 3 intakes. The gen 2 intake was much differant than the gen 3.
Not meaning to correct...Just trying to clarify.

 

The port size is different, correct. The biggestr difference in them was the runner size (ports, valves too), but the spacing and bolt pattern is the same. I will be going to the JY to grab some valve covers and will check the Gen2 UIM, but IIRC it is a direct bolt-on (with the exception of EGR/brake booster locations and TB size). If somebody knows otherwise...

BTW, all gen3 3100/3400 tops are the same (after 2000)

 

I got this from over at 60V6. The gen 3 is up front and the gen 2 is in the back.


Mabye Im getting confused. Are you breaking down the 3100 into 2 generations?
gen 1--> small port // gen 2--> large port

 

Gen1 is our iron head motors, gen2 is the aluminum heads motors, and Gen3 is late (post 1994) motors. Gen2 is when they started calling them 3x00. There is a family tree there, I wanted to look up your question, but the PC was needed by a guest of ours. Now I am curios myself...
http://60degreev6.com/view.php?pg=familytree
----------
I love the search button...
http://60degreev6.com/showthread.php...n2+3400+plenum

 

.... guess I'm not the only geek....

 

Aw see now Im all confused again. The engine in the back of that pic is the aluminum head 3.1. I was under the inpression that that was the gen 2, and the 3100 and 3400 were gen 3s and the 3100 ports were just made larger later on. Im just going to stop now before I keep spreading mis-info
But anyways the older 3100, with the smaller ports, has 12 bolts that holds the UIM down, and the later 3100/3400 have 6.

 

Look closely at the pics, the bolt holes are not all the same. The ports line up, but it appears that some manifolds have 2 bolts per port, and the others have 1.

 

I'd like to see the shiney intake on the dirty heads. hahaha.

 

These are DIRTY...


Too bad the plenum won't fit the iron heads...

 

*sigh*

The genII was NEVER refered to as 3x00, the genII were "2.8L" and "3.1L", or just "2.8" and "3.1".

The genII was used from 1987 to 1994 in FWD vehicles, in 1994 the only platform to use the 3.1 was the J-body.

The small port 3100 was introduced in 1993 in the Cutlass only, and then spread across the platforms, except for the aforementioned J-body, in 1994.
The small port 3100 was used up to 1999. The 3400 was introduced in 1996. In 2000, the 3100 received a large port upgrade, basically the same top end as the 3400. The 3500 was introduced in 2004 in the Malibu Maxx.

The genIII UIM will NOT bolt to the genII lower. The genII lower is closer in design to the genI, but is also different from that.
To swap to a genIII UIM on a genII, you also need the LIM and heads, along with the exhaust manifolds, among other items needed for the FWD hybrid swap.

 

Hey Six_Shooter, will the Gen2 valve guides fit a 3500 head?

 

That's a good question, I don't know the answer to. I haven't had my 3500 heads apart yet, I just pulled them off the block last week.

 

AHHHHH, so the Grasshoppah has stumped the mastah? Lemme know what you find. If I am correct, the Ford SB 1.7 rockers will work beautiful on the 3500 heads (and be adjustable with my flat tappet lifters).

 

i have a 3.4 RWD block and i want to swap it in place of my 1991 3.1, but i want to change the 3.4 RWD heads to Alu heads either gen 2 or gen 3 or what do u guys suggest.

what is the easiest way to change the iron heads??

i feel like there is so much work involved. i also live in california is there anyway i can keep my 3.1 top plenun ? that way when i get smog test it will look like the 3.1 but it will be a 3.4 with alu heads?

so i cant keep my ECU if i decide to get alu heads?

 

You can keep your ECU with aluminum heads but you will need to tune it or get someone to burn you a swap chip.

There is no way you can use your 3.1 plenum with aluminum heads.

 

Damn so because of stupid California laws there is no way to keep my ecu and keep my 1991 3.1 top plenum to disguise my 3.4 build with Alu heads, looks like I have to just port and polish the aluminum heads get new pistons and alu flywheel and 1.6 rockers and call it a day??

Bore it to a 3.5 basically is all I can do ??

Unless I'm forgetting something?

 

You CAN keep the ECU, with a swap chip; but SAME ECU, however you cannot run any iron head intakes with aluminum heads. They aren't even close to lining up. I think there is a guy on here running aluminum heads with the iron head pistons, so I wouldn't say it can't be done but it would require at least higher octane pump gas.

 

Looks like I'm sticking to 3.4 iron heads port polish and replacing pistons delta 260 cam alu flywheel, new bearings, and seals, water pump and is there any specific water pump u can use that's better than stock ?

 

Just get a stock replacement water pump. If you want to underdrive it slightly, a FWD water pump pulley will do that.

Where are you finding this aluminum flywheel? I've looked for one before but never had any success. Keep in mind a FWD aluminum flywheel will not work because it is thinner (clutch may not engage input shaft properly and/or TOB may not disengage the clutch properly), and also has a smaller diameter (starter wouldn't engage at all anymore unless you relocated it to the driver's side and drilled holes in the block to mount it). You probably COULD use one but you would have to figure out what combination of parts/mods would allow it to work.

Also bear in mind that the FWD aluminum flywheel only weighs 8 lbs which is probably more ideal for a lighter car. To put things in perspective, an LT1 aluminum flywheel weighs close to the same as a stock V6 flywheel. If you want to lighten up the rotating assembly, get a 6-puck clutch in a smaller diameter than stock. Clutchnet should be able to make something like that for you.