HEY guys the thirdgen 2.8 is the same used in the pontiac fiero and other GMcars ..or is like a H.O 2.8 ???

 

Yep, it's the basically same deal, year for year. I think the only differences are that the Fiero MPFI 2.8 recieved a Holley throttle body, and all Fieros got a better-designed exhaust manifold.


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!

 

The Fiero got the HO Cam stuff as it is the same cam used in the MPFI (same as out 1985-1992 2.8/3.1 MPFI cam) from the get-go, WHEN they put the V-6 under that little hood.

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Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA

 

yes the same block and I beleive you can even change the vast majority of the part and they will work fine. But yes they are better performers in the Fiero.

 

The Fiero was lighter, but if you look at Fiero sights you can find many parts that would work on our rides to give more power. Rockers, Cam's, fuel pumps, ect...

 

most parts will interchange. the starter is on opposite sides of block, you would have tp have new holes drilled to use, the intake is on backwards on a fiero(faces away from accesories). you can get the 2.8 to over 200 hp and 200 ft lbs torque easy if pay attention to fiero guys

 

The answer is no, no, and no. The block is a FWD block, due to the midengine nature of the car. The intake components would be hard to adapt and are substandard to the stock 3.1 components, so again not worth the effort. Basically the only part that the Fiero has that is really any better is the exhaust manifolds, and good luck finding a set.

 

Drew,
Explain why those manifolds are any better than the F3 manifolds?
Thanks!
I can't buy that the Fiero cam is not a good option to swap out.
What about the heads, are they the cantered valves like the other FWD heads?
FYI, if they are cantered valve heads, they are worthless on our North South engines.
You can't CAN'T use them.

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Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA

 

I dont see wear GM would make two different 2.8 blocks, that would be costly. The 2.5 has dual engine mount points, the 2.8 shouldn't be any different. I would like to see some casting numbers to compare parts, that would eliminate alot of confusion on this matter. I can find tons of cast. #'s for V8 chevy, but nothing for V6's...anybody know where to find them??????

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Ya can't have too many fast Chevys!

 

Yeah, GM's got two 2.8 blocks; FWD and RWD.

Karl, what's an F3 manifold? Anyway, you know how our f-body manifolds are cast into one chunk of iron? Well, the Fieros got a stainless steel tubular exhaust manifold- it's one straight backpipe, welded to three smaller pipes. There's some restrictions where the three "feet" are welded to the backpipe, but all you need is some time with a grinder to increase flow big-time.

And I don't think it'd be possible to adapt those tubular manifolds to our car; I think the pipes would be aimed at the firewall with no room for a y-pipe- the money'd be better spent adapting 3.4 headers to the car.

Damn; I thought I had a picture somewhere of the Fiero exhaust manifold, and how to fix it (the welds break), and how to port it- but I can't find it. Oh well.

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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!

 

drew- by your logic a 3.4 out of a camero would not swap into a fiero. however it will. we use the heads,intake,throttle body and all other accesories off the 2.8 we use the short block 3.4 and its injectors. Like I said the starter mounts on the wrong side, but you just have to have it machined for a starter on the other side.

 

Corvette 1974=C3's (Third Generation of Corvettes
1985 Firebird=F3's (Third Generation of F-Bodies)
Are the Cams the same, tho? I would believe so.

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Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA

 

Why swap a Fiero cam when there are MUCH better cams available? Besides who would swap in a used cam from a car they stopped producing in 1988? Just take my word for it, I've contemplated using 2.8 Fiero parts on the 3.1 and there's no reason to bother with it.