3.4l stroker swap 84 fiero (Page 1/1)
Noah_turner JUN 21, 05:33 PM
Hi! My name is Noah. I am only 15 but I have loved cars my whole life. I am looking to get my first project car. I have found a 1984 fiero in my area that is in my price range that I have decided is going to be my project. But I have a 1986 S10 Blazer that has a 3.4 stroker in it that my dad's friend put in before we ended up with it 6+ years ago. But since then it has sat and the body and frame are rusting away so it to far gone to be saved. So my thought was that the fiero being from the same time period and some having a 2.8 v6 (which the 3.4 shares a block with) the stroker would be a fairly simple swap. My questions are has anyone done this swap or a swap like it? And does anyone have any advice for me as I start out with my project car adventures? Thank you

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Noah Turner

Patrick JUN 21, 05:56 PM

quote
Originally posted by Noah_turner:

I have a 1986 S10 Blazer that has a 3.4 stroker in it that my dad's friend put in before we ended up with it 6+ years ago. But since then it has sat and the body and frame are rusting away so it to far gone to be saved. So my thought was that the fiero being from the same time period...



...and keeping in mind that Fieros are just as prone to "rusting away", check before you start spending time and money. There are tons of threads here covering where to look for rust on a Fiero.
olejoedad JUN 22, 11:17 AM
The swap would be easier if you could find an 85 - 88 V6 car with the transmission you want.

A bad motor in the Fiero would be a plus, as a lot of motor parts swap from the V6 Fiero motor to your 60° V6 stoker.
Front cover
Water pump
A/C brackets
Lower intake manifold
Middle intake manifold
Upper Intake Manifold
Distributor.
Oil pan
Exhaust manifolds
Distributor
Oil pressure Sender mounting tube and bracket
Etc.....
And whatever else you need, the list is not inclusive.

But!!!!

If it's an aluminum 3xxx (3100, 3400), you would NOT need those parts because they don't fit the 3xxx 60° V6 engine line.

The Fiero transmission will fit either cast iron or aluminum engines.

Hope this helps.

[This message has been edited by olejoedad (edited 06-22-2024).]

Patrick JUN 22, 05:23 PM

quote
Originally posted by olejoedad:

But!!!!

If it's an aluminum 3xxx (3100, 3400), you would need those parts because they don't fit the 3xxx 60° V6 engine line.



Just for clarification purposes, I think you accidently left out the word "not".
Noah_turner JUN 22, 05:26 PM

quote
Originally posted by olejoedad:

The swap would be easier if you could find an 85 - 88 V6 car with the transmission you want.

A bad motor in the Fiero would be a plus, as a lot of motor parts swap from the V6 Fiero motor to your 60° V6 stoker.
Front cover
Water pump
A/C brackets
Lower intake manifold
Middle intake manifold
Upper Intake Manifold
Distributor.
Oil pan
Exhaust manifolds
Distributor
Oil pressure Sender mounting tube and bracket
Etc.....
And whatever else you need, the list is not inclusive.

But!!!!

If it's an aluminum 3xxx (3100, 3400), you would need those parts because they don't fit the 3xxx 60° V6 engine line.

The Fiero transmission will fit either cast iron or aluminum engines.

Hope this helps.




This helps a lot! Now where on the engine would I find that and if not there or worn to much to tell are there any tell tale or distinguishing factors?
Raydar JUN 23, 08:26 AM

quote
Originally posted by Noah_turner:

This helps a lot! Now where on the engine would I find that and if not there or worn to much to tell are there any tell tale or distinguishing factors?



A magnet will stick to the cast iron heads. Won't stick to the aluminum heads of the 3400.
Or you can shoot some pics to us.

Old Joe is right, though. You'll be way ahead of the game by buying an 85 or newer car with a V6 - preferably already with the trans that you want.
The 84 will require a substantial amount of rewiring to make it support a V6, since it never came with one.

82-T/A [At Work] JUN 24, 09:23 AM
Another option for your 84... honestly, is to use a carburetor, or even aftermarket fuel injection. If the Fiero is cheap, and rust-free... there's no significant (in my mind) difference between an 84 through an 87. The biggest benefit to having an 85+ that already has a V6 is that you can basically swap out the V6 and use the existing motor mounts. Going with an 84, you'll need to source several parts. But I emphasize again that if the car is rust free and in pretty decent shape... you can always buy the brackets on eBay or from some of the many parts suppliers (like The Fiero Farm, the Fiero Factory, and Mike's Fiero Parts).

Performance parts for the iron-head V6 were super-common back in the day, but they're pretty rare now. They even had an Offenhauser intake that allowed you to use 6-individual Solex or Weber carburetors... which must have sounded totally awesome... but you're probably looking at a lot of money if you want to go that route.

If you're just interested in getting it running, you can always use the stock 4 cyl fuel pump, drop a stock carburetor intake from Edelbrock on the V6/60, and install a Rochester QuadraJet or an Edelbrock carburetor.