3400 heads on a 2.8?

[I-wear-pants]

I have read about how much better these heads flow, so how hard would it be to put them on a 2.8? Any information will be greatly appreciated.

[X11_STE]

Try it and let us know how it turns out.

[geoffinbc]

I think he is trying to say use the search button. There has got to be thousands of pages about this topic. Also look in the swap section. Once you have read the material and have any remaining questions ask them here.

[Guest]

I have to ask, which gen of 2.8 are you asking about?

[I-wear-pants]

I have to ask, which gen of 2.8 are you asking about?

I believe it is considered the 1st gen, but im not sure. Its the a Fiero 2.8 if that helps.

[El_Diablo]

what year? is it the original engine?

[Guest]

Yes, the 2.8 that came in the Fiero is a genI.

This is more involved than just a head swap. You will also need to swap the intake, and varuious other parts. including the ECM and ignition system. The genIII intake will not allow the use of a dizzy, and therfore requires conversion to a DIS ignition, in which case requires a crank trigger to be fabricated when starting with a genI block.

If you're still interested I can give you the details of what I did in my swap.

Min is in a 1985 GMC Jimmy.

[I-wear-pants]

I would like to see the details of ur swap please. Thanks, Matt

Yes, the 2.8 that came in the Fiero is a genI.

This is more involved than just a head swap. You will also need to swap the intake, and varuious other parts. including the ECM and ignition system. The genIII intake will not allow the use of a dizzy, and therfore requires conversion to a DIS ignition, in which case requires a crank trigger to be fabricated when starting with a genI block.

If you're still interested I can give you the details of what I did in my swap.

Min is in a 1985 GMC Jimmy.

[Guest]

Ok, here's the basic details:

'87 2.8L block from an S-10
'93 3.1 crank
'87 rods
Federal mogul hypereutectic pistons, stock replacement for '90 to '93 3.1.
GMPP bumpstick Same as Crane 260-2
'95 3100 top end.
Custom made headers
T3 turbo
Mitsubishi Startion FMIC
'88 Cavalier ECM and (modified) harness.
TGP code on J-body PROM
Custom crank trigger for DIS ignition (see pics below)







Now I changed the piston to keep an SCR of around 9:1, using the 2.8 pistons with the genII or III heads will get you around an 11:1 SCR.

What I would recommend for you, is to swap to a genII or genIII block, so that you will also get a crank trigger location, and will not have to get a custom made piece like I have. You can also change to a 3400 at the same time, getting more power that way too.
I would have used a 3.4L block from an F-body but was not able to find one that was affordable. 3400s are pretty inexpensive however.

My next full build I will be starting with a 3400, because of the better oiling, and a few other reasons as well. I will in my case have to make at least one custom mount.

If there's anything more you'd like to know, just let me know.

[I-wear-pants]

The thing that is keeping me away from doing a full 3400 swap is I don't know of anyone that has done one in a Fiero and im not sure if it would need any custom parts. Also I would have to rewire the thing.

[Guest]

You'll have to change the wring for the hybrid you propse anyway, due to the change in ignition system.

I do beleive it needs custom mounts as well, but I don't remember the details, the mounts will be easier to make than the crank trigger.

Look on Penocks Fiero forum, I know there were a couple members there running genIII and genII 660s, with some detailed information.

[Froggx]

Just in case it's still relevent, the 3400 bolts right into the fiero using all the stock fiero mounting equipment. You have to clearance the oil pan a little for the front motor mount to fit.

[Guest]

Just in case it's still relevent, the 3400 bolts right into the fiero using all the stock fiero mounting equipment. You have to clearance the oil pan a little for the front motor mount to fit.

Good to know.

[geoffinbc]

That would be a fun ride. My buddies Z24 is a riot. I would love to have a Fiero with a 3400.

[94Camaro]

Ok, here's the basic details:

...What I would recommend for you, is to swap to a genII or genIII block, so that you will also get a crank trigger location, and will not have to get a custom made piece like I have...

i know an easier way to do that. go to a junkyard or ebay and find the timing cover from a 1993-1995 3.4L RWD Camaro. it has bolt holes on the timing cover for the little magnetic crank trigger. the integrated it into the timing cover right behind the harmonic balancer and put a little metal ring on the balancer to watch the trigger state.

easiest way i know of to make all that work.