If you're not after every last bit of power, I say try the GM intake. It would look cool, especially with some factory valve covers.

 

I think a massaged iron intake stands a good chance of making as much power as an Eddy Performer 2-o.

Being there is a low compression mule motor with a Performer 2-o and Holley 800dp in my car that runs 12.40's for testing,
It got me thinking about modifying one of the iron intakes over the winter and doing a track test comparison this spring of a modified iron intake vs the Eddy Performer 2-o on it now.

Then for giggles take the Holley 800dp off, and see how the 800 Q-jet I have fairs against the Holley on the iron intake.

 

I think a massaged iron intake stands a good chance of making as much power as an Eddy Performer 2-o.

Being there is a low compression mule motor with a Performer 2-o and Holley 800dp in my car that runs 12.40's for testing,
It got me thinking about modifying one of the iron intakes over the winter and doing a track test comparison this spring of a modified iron intake vs the Eddy Performer 2-o on it now.

Then for giggles take the Holley 800dp off, and see how the 800 Q-jet I have fairs against the Holley on the iron intake.

12.4 with peanut ports? That's pretty cool. What cam are you running ? And (assuming you are referring to the car in your signature) with 4.10's don't you run out of RPM before the finish line?

 

OEM high rise works well on a OEM large oval and will "work" on the peanut port but the air will sure be smacking a wall on it's way in on the peanut. I'd try it on the peanut just because if I already had the intake.

 

Started cutting on the intake, will have pictures soon.

 

You should consider the street demon 750 instead of the old QJ. I've heard a lot of good things about it.

https://www.jegs.com/i/Demon-Carbur...RDWARIsAEEYhrf2GbEZUYBbNZtQfkFcng7Dh60MfsiADdsuZtM46oWVTd-Rwf3TK5QaAtyfEALw_wcB

 

Is there enough material in the peanut intake port to open it up to a regular oval port gasket size?? I would get the grinder out and do it to avoid the step between the intake and the port. I wouldnt go crazy on it because the smaller runner size near the valve would just increase velocity.

 

The intake is a early iron, large oval high rise manifold, not the common variety low rise these days.
I will be using it with some massaged 236 peanut port heads, for a daily driver 454.

 

Are you really running "peanut" ports rather than large oval? You can pick up a set of 781 or 049s fairly cheep and they'll flow beyond the 4500 rpm range which is where the "peanuts" will start to fall off in their flow.

Here's an article where Super Chevy tried peanut vs ported oval vs aftermarket

Oval Port Big-Block Chevy Cylinder Heads - The Big O - Super Chevy Magazine

 

Are you really running "peanut" ports rather than large oval? You can pick up a set of 781 or 049s fairly cheep and they'll flow beyond the 4500 rpm range which is where the "peanuts" will start to fall off in their flow.

Here's an article where Super Chevy tried peanut vs ported oval vs aftermarket

Oval Port Big-Block Chevy Cylinder Heads - The Big O - Super Chevy Magazine

Yes I am.
Done the large oval thing, a few times, and have 3 sets of 781's and 1 set of 049's. (signature 468 is one of them)
Trying out a odd ball, old school daily driver street combo, that's been binging around in my head, and 5000 rpm is all I'm after.

 

This Weiand intake has peanut port sized runners.

https://www.holley.com/products/intakes/dual_plane_manifolds/parts/8122WND

 

This Weiand intake has peanut port sized runners.

https://www.holley.com/products/intakes/dual_plane_manifolds/parts/8122WND

That's basically what I'm trying to make the iron intake into.


If I can make this old iron intake and Q-jet work as good, I'll only have time a carb kit into it, instead of over $800.00 for a new intake and carb.

 

It's fairly well known that peanut port heads can be fairly mildly ported to get over 500 hp, with dumbass torque to boot. Also, a well built quadrajet will be nowhere near maxed out at 500 hp. I have a buddy, Bob Hinson, who has a '67 Pontiac Tempest that he's had since the early 70's. It has run a best of 11-teens, with a quadrajet, no nitrous, with full interior, functional air conditioning, power steering, power brakes, and the weight of a cage added. This with a pontiac 455. The car was featured in Car Craft in 1995. So yes, properly built, your quadrajet ought to haul the mail. I wouldn't be surprised if it would outrun the 800 dp in your case with the small primaries and all. Ought to REALLY be torquey on the street.

 

Re: Oval port intakes. ( pictures )

Here is a side by side comparison of the two intakes.

Heights front and rear are: Eddy 4-5/16" front 5-5/16" rear.
Iron 4" front 5-9/16" rear.

Untouched intake port exit dimensions are: Eddy 1-3/4" wide 1-5/8" tall.
Iron 1-5/8" wide 1-13/16" tall.

With the carb adapter I converted to a open spread bore spacer the height is at 4-3/4" front and 6-3/8' rear.

The 236 peanut casting intake ports are 1-5/8" wide and 1-5/8" tall untouched.

By runner size and shape the iron is superior in my opinion (other than weight) and will blend together nicely when ported to match with the 236's final runner size after porting.