Thinking about a 3.4 DOHC swap

I_wear_pants · Post by **I_wear_pants** » Tue Oct 25, 2005 10:58 pm

Ok I have thought about a 3.4 dohc swap for awhile, and more recently have been hearing alot more about them. I think that a 3.4 would be perfect for building a well rounded fiero. So does anyone want to help me out by giving me some information about the swap?

Aaron · Post by **Aaron** » Tue Oct 25, 2005 11:54 pm

I_wear_pants wrote:Ok I have thought about a 3.4 dohc swap for awhile, and more recently have been hearing alot more about them. I think that a 3.4 would be perfect for building a well rounded fiero. So does anyone want to help me out by giving me some information about the swap?

http://www.dohcfiero.com

Contact Erik at Pfiffle, he will build you a plug and play harness.

Buy an engine.

Buy a 88 Fiero.

Take the 2.8 out.

Put the 3.4 in.

Plug the 3.4 in.

Start the 3.4.

Try to keep the back end straight :thumbleft:

crzyone · Post by **crzyone** » Wed Oct 26, 2005 12:01 am

I did the swap, its really very easy. I did a small build thread, and many others have over on Old Europe. If you decide to do the swap I'd be happy to give any advice.

It was a fun engine, woke the car right up. I almost wish I would have kept it, but I came across a N* for a price I couldn't refuse.

Here is my build on Old Europe. Not really a build, more of a progress report.
http://www.fiero.com/forum/Forum2/HTML/053341.html

Series8217 · Post by **Series8217** » Wed Oct 26, 2005 3:47 am

I'm working on a complete engine swap guide. It will be done by the time you actually find and purchase a motor and finish freshening up the motor itself.

donk_316 · Post by **donk_316** » Thu Oct 27, 2005 10:16 am

Id skip the "buy an 88" though.

otherwise yeah what he said.

Aaron · Post by **Aaron** » Thu Oct 27, 2005 2:13 pm

donk_316 wrote:Id skip the "buy an 88" though.

otherwise yeah what he said.

Sorry, I have biases. I said that becuz the swap is easier, the 3.4 will bolt on the factory mounts, and if you had the money, be honest, you'd choose an 88 car (Besides Indy's and other special ones of course).

Kohburn · Post by **Kohburn** » Thu Oct 27, 2005 2:39 pm

aaron wrote:
donk_316 wrote:Id skip the "buy an 88" though.

otherwise yeah what he said.
Sorry, I have biases. I said that becuz the swap is easier, the 3.4 will bolt on the factory mounts, and if you had the money, be honest, you'd choose an 88 car (Besides Indy's and other special ones of course).

actually i like the pre-88' because parts are cheaper - more readily available - there is more aftermarket support - etc

I_wear_pants · Post by **I_wear_pants** » Thu Oct 27, 2005 4:43 pm

The car I'd be swaping it into is an 87 so I know I have to mod the motor and trans mounts. Also do you need a different flywheel? I know on 3.4 pushrod engines you need an 88 neutrally balanced flywheel...

stimpy · Post by **stimpy** » Thu Oct 27, 2005 4:50 pm

Kohburn wrote:
aaron wrote:
donk_316 wrote:Id skip the "buy an 88" though.

otherwise yeah what he said.
Sorry, I have biases. I said that becuz the swap is easier, the 3.4 will bolt on the factory mounts, and if you had the money, be honest, you'd choose an 88 car (Besides Indy's and other special ones of course).
actually i like the pre-88' because parts are cheaper - more readily available - there is more aftermarket support - etc

:withstupid: All I've owned have been 86's. I'm content.

I'd avoid the swap, though, because you'd have aaron giving you "advice" all the time. That would get on my nerve.

donk_316 · Post by **donk_316** » Thu Oct 27, 2005 5:56 pm

Yeah i think you do use the neutral flywheel. god i hope so...lol!

Kohburn · Post by **Kohburn** » Thu Oct 27, 2005 6:33 pm

yeah use a an 88 flywheel or similar like an 88 berretta etc
as long as its a FWD 60*v6 gm flywheel after 88 it should be fine

crzyone · Post by **crzyone** » Thu Oct 27, 2005 6:44 pm

I always tell the parts counter guys I need a 91 Cavalier Z24 flywheel. They are all the same but seems to be alot of cavi's in junkyards.

XzotikGT · Post by **XzotikGT** » Sat Oct 29, 2005 2:23 am

I have an 87' with the 96 3.4 in it, adn I didnt have to change any of the mounts. I think it will bolt right up to any Fiero that had the v6 in it. All I had to do is trim the front mount bracket because it is a tad thick.

Blue Shift · Post by **Blue Shift** » Sat Oct 29, 2005 3:45 am

On my 87GT (and other pre 88's I'm sure) the motor WILL bolt straight up to the Fiero's 3 mount system - tranny has two, and the L shaped 2.8 bracket will bolt straight onto the 3.4. Matter of fact, I tossed it in on the stocker mounts, and didn't like how it sat, and how loose it was.

I did mod my mounts so I could use thinner, tougher, cheaper Dodge truck mounts. The U shaped front mount on the 88 supposedly bolts to the block on both sides, but the way I see it, the rubber mount would break before the block or L bracket so I don't think its really necessary.

product1620 · Post by **product1620** » Wed Jan 18, 2006 10:56 pm

Hold on so the 3.4 tdc will bolt right up to the factory mounts (no fabbing) on all v6 models or just the 88's. :scratch:

Shaun41178(2) · Post by **Shaun41178(2)** » Wed Jan 18, 2006 11:04 pm

all years it will bolt right in.

Welcome aboard.

donk_316 · Post by **donk_316** » Wed Jan 18, 2006 11:13 pm

i have the correct flywheel for sale.

product1620 · Post by **product1620** » Thu Jan 19, 2006 12:42 am

Thanks shaun! :thumbleft:

Kohburn · Post by **Kohburn** » Thu Jan 19, 2006 7:19 am

Shaun41178(2) wrote:all years it will bolt right in.

Welcome aboard.

with some minor grinding to the fiero bracket.. about 10 minutes work and it bolts right on

product1620 · Post by **product1620** » Thu Jan 19, 2006 3:47 pm

minor grinding? does anyone have any build threads on grinding the brackets, the only ones ive seen have been people using truck brackets?

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Thinking about a 3.4 DOHC swap

Thinking about a 3.4 DOHC swap

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