I have a tired 2.8 in my GT, and I want more power but I want to keep it looking stock.
I am also on a budget (aren't we all?) so I need a required parts list only (duh).
I'm going to transfer as many parts over from the 2.8 as I can (i'm being so obvious, lol).

first a few questions.
#1 Can someone provide a spec. sheet on the 3.4 so I can compare it to the 2.8?
#2 What will I not be able to use from the 2.8?
#3 (All fiero 2.8's are "High output" with bigger valves) so are the 3.4 heads any better?
#4 3.4's already have 1.6 ratio rocker arms right? should I even spend money on upgrading the rockers?
and with what should I upgrade with?
#5 I have to wire in the 3.4's ecm right? is it "plug n' play?"
#6 Would you like to provide any info on what I didn't ask for?

#1 The 3.4 is about 20hp more.
#2 The block is physically the same except for the starter location.
#3 The heads are the same
#4 The heads are the same, not 100% sure on the valves.
#5 I used the 2.8 ecm and it worked fine
#6 Get the starter jig for drilling the new holes. Mine was already converted, but I think the oil pan and timing cover are different?
The blocks are basically the same. You can't tell them apart without seeing the stamping. The 3.4 just has a bigger bore.
I noticed a difference. Sound was a little better, and had more grunt. Seems to rev a little quicker also.
It's a cheap upgrade if you are replacing the motor anyway. Not much if your 2.8 is strong.

I'd say go for it.

You can search for all the parts you need on here, but there aren't that many

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88 GT "The Stray" 4.9L
07 Solstice GXP 2.0L turbo
07 Suburban LT2
09 Avalanche LT3

quote Originally posted by pontiackid86: i'm sure i could fly a plane no problem.

the 3.4 block is different from the 2.8, when you see them together it's obvious. the 3.4 has a much thicker block for strength and external webbing on it.
the 3.4 brings only 20HP, but a ton more torque, more than 40 ftlb. from idle stomping on it will get your attention compared to the 2.8.

it takes to boosting far better than the 2.8 6-8 psi on the 3.4 is a non issue and some do that level of boost without an intercooler as your intake temps will be below 220DegF

L32 - 3.4-liter V6 engine This engine produced 160 hp (119 kW) at 4,600 rpm and 200 lb·ft (271 N·m) torque at 3600 rpm
L44 - 2.8-liter V6 engine This engine produced 140 hp (104 kW) at 5000 rpm and 155 lb·ft (216 N·m) of torque at 3600 rpm.

Both of those are on a NEW and perfectly maintained engine. Most high mileage fiero V6 engines are probably producing 110HP and maybe 120-130 FP torque due to being in poor condition and their cams are probably wiped out or severely worn due to people using regular oil without a ZDDP additive in the engines for the past 20 years. Compression low, etc...

You need basically all the parts off of the 2.8 if you really want it to fit you need to swap the timing cover and oil pan as well.

Everything you need to know about the 3.4 install into a fiero is located here.... http://fiero34swap.eleventenths.org/ that is the most complete pile of information on the 3.4 swap you can find.

as for upgrades. if you are not going to add a turbo or a truelo intake, new rockers will do nothing. the 3.4 heads are 100% identical to your 2.8 heads. your intake restriction is with the stock fiero upper intake. NOTHING you do to the car will fix that other than replacing the intake with something else.

AS for "plug and play" yes. but it will not run perfect. you really need to pay darthfiero $100.00 for a custom tuned chip.

What cant you use? all the old gaskets. You need to buy an entire gasket set. I strongly recommend looking over the parts on the 3.4 as you tear it down. 3.4's out of camaros and Firebirds were abused and not taken care of. Plus the EPA had all the oil makers redesign oil to not use ZDDP so your cam is getting far more wear than it should. If it's a high miles engine it probably needs a new cam. new timing chain may be a good idea, etc... I personally replaced everything that was a wear item. All new seals, new timing chain and sprockets, new oil pump with a high volume, new oil pickup screen, etc...

While I had the cradle out, I replaced the struts, springs, axles, etc..... Also upgrade exhaust manifolds, the 3.4 moves more air, so it needs to move more exhaust. at least port the stock logs.

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Best RV, Camper, and Trailer dealer in West Michigan. http://www.cliffstrailersales.com and he's a fiero owner too!

[This message has been edited by timgray (edited 03-03-2011).]

From what I heard so far I can then go along with this.
(I know I said I was strapped for cash, but this will be a project for years to come)

A new cam would be needed (I was going to upgrade the cam anyways, lol)
I was going to upgrade the pistons (hyperutectic), rings (cro-moly), valves (stainless), springs (for the obviously higher lift).
As well as port and polish the head with a multi-angle cut (3 or 5 cut).
And put on whatever has rollers. (timing chain, rollers, bearings?)
And since this engine has more structure than a 2.8 I think it would be alright if I just upgraded the engine's fastening components.

The 60* V6 cam in the fiero is actually a 276 cam (if going by intake duration @ 0.004 in. like most cam company's do these days)
but the stock H.O. cam has a little less lift and duration than the following mild upgrades...
A CompCam 260, Crane 260, and Crower Baja-Beast.

see this link for a quick cam comparison, http://spad.sytes.net/fiero...s/60_Degree_Cams.pdf

I'm going to try and find a cam where the max valve lifts would be around .5" using 1.6 rockers...
(I swear if I could find a 1.7 ratio rocker for a 60* V6 I'd use that instead)

alright, thanks for the info guys! =D