I've got the burrs and I'm ready to port.

The right hand side ports in the lower piece look like they can be ported out far enough that they may require porting the upper piece on the dividing wall to make them as large as the left bank.

The upper piece is the two chamber model.

Any advice?

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Arn Brown, 1985 Fiero GT, 15.474 ET stock
Mods underway.

only thing I can think of is dont port them bigger than the ports of the intakes on the head. also, leave a somewhat coarse surface, not a smooth polished surface.

Get yourself some intake gaskets. Put the intake bolts thru the holes and line up the gaskets and tape them on. Then take a marker and mark the openings. The right side cannot be opened up to match the head. It is smaller for a reason (to maintain a high low-end torque).
On the right side I just angled the bottom edge to cut down turbulance.

I did the same thing with the riser, I lined it up with the mounting bolts and marked the lower section with teh gasket, Turned the riser upside down and aligned the gasket and marked that. Then with a deremel tool I slowly matched them up. If you are having the heads done at a shop, Tell them to gasket match the ports. If your using stock heads, You can align the gasket and match them the same way as the intake.
I also did the same thing to my exhaust ports.

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Happiness isn't around the corner...
Happiness IS the corner.

I gasket matched mine to my heads as Oreif described above. You have discovered what I was describing in the other post about the upper intake.
Richey

So, how big relatively do the right side ports end up being?

The left side holes, surface to surface are 1 and 9-16ths. The right side holes are 1 and 1-16th. That is a ratio of about 3 to 2 in size. Should that ratio be maintained?

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Arn Brown, 1985 Fiero GT, 15.474 ET stock
Mods underway.

Arns,
I wouldn't be as much concerned with the ratio between the runner sides as I would be with gask matching the intake to the heads, if you look at the bottom side of the intake lower you will see why. If you cut the smaller runners to match, you will punch through a wall (they go almost straight up).
I do think your idea of matching the ratio has merit, I just do not think you will be able to remove enough material for it to matter and the smaller runners will help with low end torque. Hope this makes sense.
Richey

Thanks to Dave and Richey.

I'll keep stumbling on "with a little help from my friends".

Arn

**DISCLAIMER**
**I have not run my engine with this setup**

**I am not sure if I have done the right thing or not**

**Only the completed engine will tell the story**

Orief is right on the money with the low end torque increases due to long thin runners. I owned a set of Edelbrock headers for about 2 days (sold em) and the tube lenghts/diameters are of different sizes on the header to match the intake.

It is possible to get the intake ports really close to equal size. If you cut off the bottom of the exhaust crossover, clean the area with a sandblaster, and apply some HI-TEMP epoxy to the underside of the manifold. The ports on the small side will still be slighlty smaller.

You got rid of it, but why?

Was the porting a mistake?

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Arn Brown, 1985 Fiero GT, 15.474 ET stock
Mods underway.

I Got rid of the Edelbrock header, NOT THE MANIFOLD.

The intake manifold is still in the plan(I sold the headers). I have ported the heads to match the manifolds. I plan on using equal length headers {1.5" DIA 28" Length}.

I WILL POST DYNO RESULTS.

DanielK,
Your intake mod looks really trick!!!
What are you putting the motor in. I did not know Edlebrock made a header for a Fiero.
What kind of head work have you had done to be able to get that much flow and what cam?
I thnk you may lose a lot of low end with single plane upper mod and the larger runners.
With the right cam and valve train though I bet that will scream up high.
Richey

The header was built for an S-10. I was thinking about modifying the part to fit my Fiero.

As far as the heads go I did the standard gasket match and ground the intake vane to a sharp point. I smoothed the valve pockets and opened them up. I unshrouded both the intake and exhaust valves (I will use the 3.4TDC pistons to bring the compression back up). I opened the exhaust ports to 1.2".

I think with the 1.5" equal length headers and a 272H cam that I should have reasonable power over 2500 RPM. I will post pictures of my heads later.