V6Discussion and questions about the base carbureted or MPFI V6's and the rare SFI Turbo V6.
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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).
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...)
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.
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)
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
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I love the search button... http://60degreev6.com/showthread.php...n2+3400+plenum
Last edited by firstfirebird; 08-02-2007 at 09:44 PM.
Reason: Automerged Doublepost
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.
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.
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).
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