Offenhauser Intake? Or Edelbrock Intake?

[82-T/A [Work]]

Hey guys,

I am planning on purchasing a 1985 Fiero 2m4. It's a very stripped down base Fiero with a manual transmission. I intend to completely strip it, lower it about an inch, and basically.. I plan to just use it for autocrossing.

It currently has a Tech-4 in it right now, and I'd like to drop in a V6/60. I've got a source on a $99 dollar GM 2.8 shortblock, completely assembled, and never used. I've got some spare Fiero heads, and I'd really like to make this carbureted. I'm planning on buying a carbureted intake manifold.

My choices are to go with either the Edelbrock manfiold, or the Offenhauser manifold. I can get the Offenhauser manifold for about $50 bucks. Is it worth it? Do you guys know if this manifold is BETTER than the Edelbrock manifold?

Also, what distributor would you recommend that I use for this engine? Is there a way to use the factory gauges while bypassing the computer all together?


Thanks!

[82-T/A [Work]]

Oh yeah, I also wanted to ask... what carburetor would you recommend? I can get either the 2-bbl or the 4-bbl intake piece. I don't currently own any 2-bbl carburetors except a webber but I'm using that on my 73 Bus.

Can I install one of my rochester quadrajets? Or would you guys recommend I go with something else?

Since this IS carbureted, and I don't have to worry about computer control at all, what would be a GOOD camshaft that you guys would recommend? I'd like something with a LOT of mid to upper rpm kick. I don't care how crazy, or emissions unfriendly it is because this will only be used for autocrossing. I probably won't even register it (unless they make me).

Thanks!

[Guest]

I have a 2 bbl intake I think laying around if you would want it. I can get a pic of it to show you what it looks like. I want to say its a GM peice and is a prototype perhaps.

Let me know.

Shaun

[82-T/A [Work]]

Yeah! I'd love to see pics of it.

Thanks!

[Guest]

Here is a pic of it. its in the left hand side of the pic. i only have that pic for now. Sorry about that. New ones soon if you like.

Its a GM piece. GM 476512

Shaun

[RacerX11]

That 2-barrel intake looks like a stock one from an S-10 or Camaro.

Marty

[82-T/A [Work]]

Yeah, I'm really weary of the Edelbrock one because from what I understand, the left side ports are larger than the right side ports. Apparently they do this so that the LEFT side provides more top-end power, and the right side provides more low-end power.

Isn't that "bad"? I mean... I'm sure they wouldn't have done it if it was a poor idea, but I don't really like the idea of opposite sides of my motor not functioning the same way?

I'd like to build up a DECENT high-revving 2.8 (I'd like to get power to 6,500 rpms) but also decent mid range power. This will be going into a Fiero. What would you guys recommend? I didn't see anything on the Edelbrock web site, but I know they sell a kit...


thanks,

[RacerX11]

I am planning something similar for my '87 Fiero. I have a basically stock 2.8 short block, and I will add some ported iron heads, Crane H272 cam, and a modified S-10 2-barrel manifold. I am modifying the manifold to open up the throttle bores, and enlarge the runners for more flow. I will be using a 350 truck TBI unit on an adapter plate. This will require a reprogrammed computer, but should allow for good top end power using mostly off-the-shelf GM parts with some fabrication.

Marty

[geoffinbc]

Get the offy manifold and run a 4bbl (since the offy is 4bbl)

Run a solid roller lifter cam and port match the heads and intake. You can the run it up to 7000RPM. Provided you have the right valvetrain components that wont float.

[jeffie8696]

7000 rpm on stock pistons scares me.

[614streets]

Get the offy manifold and run a 4bbl (since the offy is 4bbl)

Run a solid roller lifter cam and port match the heads and intake. You can the run it up to 7000RPM. Provided you have the right valvetrain components that wont float.

What he said. The edelbrock manifold is not something I would ever use.
6.5 -7k should have a solid lifter to minimize valve float but a hydralic cam will work to 6300-6400. Stock rods will work fine. I would not be weary of stock gm rod bolts if they are brand new.

Never reuse connecting rod bolts is what I have been taught. Exhaust port work and headers are a good ithing to consider at those rpms.