Yea... I did a search, but the only thing I found was started by "donk316" who is now banned. (My search was for "GEN III). In that thread the picture shows the Fiero intake manifold... at least the upper part. There is a lot of discussion about the distributor and the "lower inlet manifold" and the guy got banned So I'll be more specific.
I'm starting with an '88 2.8L so it already has Gen II aluminum head and DIS. If I install GEN III head, what Fiero intake manifold pieces can I keep... if any? Trim to fit would be ok, but massive mods (cut/weld, etc) would not be ok.
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01:23 PM
Pyrthian Member
Posts: 29569 From: Detroit, MI Registered: Jul 2002
Originally posted by GT Racer: I'm starting with an '88 2.8L so it already has Gen II aluminum head and DIS. If I install GEN III head, what Fiero intake manifold pieces can I keep... if any? Trim to fit would be ok, but massive mods (cut/weld, etc) would not be ok.
the '88 did not have aluminum heads or DIS, it was iron heads & a distributer. what intake manifold do you have? I've been pondering putting gen III heads on mine also, but not sure if the conversion is worth the work.
Originally posted by Pyrthian: the '88 did not have aluminum heads or DIS, it was iron heads & a distributer. what intake manifold do you have? I've been pondering putting gen III heads on mine also, but not sure if the conversion is worth the work.
'88 Fieros still had iron head engines, but everything else went to the Gen II heads/intake about that time.
Starting with a Gen II engine, the Gen III hardware should just bolt on, for the most part.
Ok... I guess I've spent too much time on 60DegreeV6.com... and a hundred other places looking at performance info. So... I'll start over. I want to put Gen III (or maybe Gen II) heads on an '88 2.8L engine. What I'm after is the bigger valves and aluminum heads. However, I want to keep the intake (if I can)... or at least the part that has "FIERO" in the manifold. I also want to use the stock valve covers. I would like to run a DIS if I can. Any info will be appreciated.
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05:38 PM
fierosound Member
Posts: 15253 From: Calgary, Canada Registered: Nov 1999
Ok... I guess I've spent too much time on 60DegreeV6.com... and a hundred other places looking at performance info. So... I'll start over. I want to put Gen III (or maybe Gen II) heads on an '88 2.8L engine. What I'm after is the bigger valves and aluminum heads. However, I want to keep the intake (if I can)... or at least the part that has "FIERO" in the manifold. I also want to use the stock valve covers. I would like to run a DIS if I can. Any info will be appreciated.
Not possible. As you pointed out, the heads are different - therefore the intake and valve covers are different.
A Gen III engine is a complete swap (engine with intake, wiring, DIS, ECM etc) and new exhaust manifolds. It will look nowhere near "stock Fiero".
There may be some confusion on your 88 engine. In 88, you could get both the Gen I engine with iron heads and distributor (Fiero) or a Gen II engine with DIS and aluminum heads (Citation, etc.).
That being said, the Fiero intake parts work only with the Fiero or other Gen I iron heads. Gen II or Gen III heads cannot use any of the Fiero intake, and if you want to convert a Fiero V6 to the Gen III heads, that will also mean using the matching Gen III intake AND swapping to DIS (which will require wire mods and a different ECM).
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10:05 PM
Will Member
Posts: 14303 From: Where you least expect me Registered: Jun 2000
Ok... I guess I've spent too much time on 60DegreeV6.com... and a hundred other places looking at performance info. So... I'll start over. I want to put Gen III (or maybe Gen II) heads on an '88 2.8L engine. What I'm after is the bigger valves and aluminum heads. However, I want to keep the intake (if I can)... or at least the part that has "FIERO" in the manifold. I also want to use the stock valve covers. I would like to run a DIS if I can. Any info will be appreciated.
Everything you've said is easy, EXCEPT having the plenum say "Fiero" on it when you're done. A machine shop with CNC tooling should be able to mill "Fiero" into the top of a Gen III plenum after you grind away the "3100 SFI" or whatever's there from GM and media blast the grind marks to restore something close to "as cast" surface finish. Once that's done, you can then have it powder coated red...
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10:53 AM
Steve Normington Member
Posts: 7663 From: Mesa, AZ, USA Registered: Apr 2001
Or you could cut away a Fiero intake manifold until all you have is the section with the letters and the ribs. Then carefully grind it until it fits the Gen III manifold and weld it into place (note, I think they are both aluminum so welding would be a bit more work).
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12:10 PM
Formula88 Member
Posts: 53788 From: Raleigh NC Registered: Jan 2001
I appreciate the really good info... and setting me straight. Now I've got to do more "homework"... do a swap to GEN II or III engine... or stay with the GEN I heads. Since I'll be racing the car, I need to figure out what will be allowed by the rules.
Originally posted by Will:grind away the "3100 SFI" or whatever's there from GM and media blast the grind marks to restore something close to "as cast" surface finish. Once that's done, you can then have it powder coated red...
The '96+ Lumina/Venture 3400 had an bare upper plenum without any markings. This would make the best starting point.
