As some of you may know, I am semi-new to the Fiero world. I had every intention of swapping a 3.1 turbo engine from TGP (1990 Vin code" V") into a Cutlass supreme. Then I found a Fiero formula. I want to ust this engine in the Fiero. I have desktop Dynoed the thing to a little over 300.(yes I have made several upgrades. This was a complete teardown & rebuild and yes the engine will be a DIS) Anyway, I don't really want to use the fiero upper & lower intake. I would like to use a 3400 heads, and lower and upper intake (If I can find em) Can anyone tell me if I use this, if it will interfere with the accys, or how some of the other crap gets mounted???

First off, I'd like to say that I really don't know the answer to your question. But... if folks can swap 3800 and SBC engines into a Fiero, then I think you could swap in a 3400 turbo. I'm sure there will be some things that will need to be modified for clearance, but you should be able to handle this if you have some level of mechanical ability. Sounds like a cool project. Don't forget to get the motor mounts, engine compartment wiring, and ECM from the donor car.

It's not a 3400 turbo, its a 3.1 that has been bored .040 over from a 1990 TGP. sorry if I wasn't clear on that.I would like to use a 3400 heads (great flow, and great valvetrain), and use the upper plenum and just grind off the "3400". I do have the ECM from the Grand Prix, but I have to get a Wiring harness.You can use a standard harness from any 3.1 car , and all I have to do is splice in the wastegate solenoid wiring.
Anyone else...help me...please

I dunno for sure, but I think yes, you can use the 3400 upper half on a 3.1 lower half. I thought there was a thread on this about 3 months ago on the advantages to doing what you wanna do.

I must say I like the idea. Please keep us updated if you do build this car.

Hank

The 3400 heads have a different bolt pattern on the sides from the Fiero heads. So you will need to make custom brackets for the AC and alternator or you will have to use the brackets from the donor engine. Note that most of the donor cars put the alternator up so high that you'd have to notch the deck lid for clearance. What oil pan and timing cover will you be using?

I will be using the oil pan and timing chain cover from the 3.1 Turbo. The oil pan has baffles in it , and I didn't see any reason to change the cover.I have beed assured a double roller timing chain will fit under the stock cover. Let me know if I'm wrong. When I was going to do this swap on my Cutlass, NOTHING needed to be changed, but using this engine in a Fiero....well you guys who have done it know more than I, Thats why I came here. Any suggestions???

I have no experience here but I'm LOVING this thread. Keep us posted on your progress. I'd like to know how it turns out.

This is my list of work/ add on's for the motor for those interested.

3.1 Turbo "vin code V"
Bored .040 over
Ross Racing pistons # 65-32 (Dished)
Total seal gappless rings
Crane Cam #h-260-2 (good seperation, good spec)
The Fiero stores underdrive pulley #52304
Cloyes Double Roller timing chain# 220-9-3137
If I can Find the 3400 top end I will use it, otherwise I'll be using Some Comp Cams roller rocker arms # cca-1413-12
along with the matching valvetrain components and get the heads proted & polished.
Borla from Twin lakes Fiero
K&n Dual element filter installed in the wheel well.(this was fairly easy, and needed to be done to make more room in the engine bay)
Centerforce DF clutch # df201914
I have a Turbo blanket from Summit# dei-101113 along with some header wrap.
I plan on getten the chip later, but from a fella on the W body msg board.

A lot of this stuff I already have, I Only need like one or two more things, But winter always slows me down as far as working on the cars.

Ok, I'm getting senile and didn't read the first post very good. I now understand you have a 3.1 turbo block and lower end. So, it sounds like you don't have the 3400 heads and intake yet? What pistons do you have or plan on using. That might make a difference on what heads you can use. I know if you use the FWD aluminum 3.1 heads and intake/EFI, then you need the pistons that match the heads. Not sure about the 3400 heads, but I'd do a little research on that subject. You don't want super low compression nor do you want the pistons hitting the valves.

The 3400 heads are "Supposed" to be a exact replacement (with the exception of having to use the upper and lower plenum) to the Gen II heads. No I don't have them yet. I don't want em if they aint gunna work.....
If someone with firm information tells me that a 3400 top end is a problem, I am just going to stick with Gen II heads and get some work done on them,and use the Plenum from the TGP.

PS-Steve- thanks for the info on the bolt pat. If the bracket is the biggest hurttle, I thing I can overcome that.

Anyone else have any good tid bits of info????

[This message has been edited by intlcutlass (edited 02-26-2003).]