I was wondering what the difference is between these two Edelbrock intake manifolds. 7111 vs 2711 both are non EGR. Going to be using it with a stock 68 Cutlass 350 Rocket and a Edelbrock 600CFM Performer 1406 carb.

 

2711 works in the lower RPM's the 7111 works in the higher RPM's.

 

So 2711 would be the wise choice for a stock 350? Its an automatic with a 2 speed Jetaway trans.

Theyre harder to find. I have an offer to buy a 7111 reconditioned for $130. Trying to figure out if itll work out the same.

 

The 2711 would be better tailored to your set up. I am using a 7111 (because I found it cheap) on a stock 330 and it works just fine. Another thing to remember is the 7111 is way taller than the 2711 which can give hood clearance problems.

 

I just installed that exact setup on a 1976 Cadillac Seville. The Caddy came stock with a 350 fuel injected olds power plant that I converted to the 7111 and 1406 Edelbrock. It does have better high end torque. I never compared it to a 2711 intake. I did have a Olds A4 on it. The 7111 out performs the A4 in pretty much every way. The only thing is I have to run 92 octane because I have dieseling with 87. That may or may not be the intake. Not sure yet. only 40,000 miles on the car.

I also have a Holley 4175 carb that I have not tried yet with the 7111. The 4175 is 650 cfm and the 1406 is 600 cfm. Both carbs are new. I did have the Holley on the A4. I did not like it as much as the Edelbrock set up i have now. I plan on trying the 4175 on the 7111 in the future just to see how in performs.

 

I guess my next question is has anyone used a 7111 w 600cfm on a stock 68 Cutlass 350convert Rocket? Did it clear the hood. Just trying to figure out if I should buy this thing.

 

It will clear but you will most likely not be able to use a stock air cleaner. On my 330 I had to use a drop base air cleaner base and put the stock air cleaner top on top of it. Worked good.

 

I called Edelbrock and they strongly urged me to get a 2711. The rep told me with the 7111 on a stock 350 I am going to experience loss of bottom end torque, wont kick in until 1500RPM and will die around 4000RPM because of the cam. Im just going to keep my eyes opened for a 2711.

 

Of course he did ! Its $100 more than the 3711 which is the same intake as the 2711 but with EGR & choke ports ....which you can just block off...

 

The rep is full of it up to his eyeballs. I experienced no lose of bottom end and if your engine is going to crook at 4000 because of the cam it's not going to make any difference what manifold is on top of your engine. If you are trying to find a used 2711 you are probably in for a long wait, they're few and far between.

 

I thought that it required more than a block off plate with the 3711. I remember seeing a thread with a list of things needed to make everything clear. Am I wrong here?

Am I better off with a 3711 with block off plate or 7111 if I had the choice

 

Not sure about the clearance. I seem to remember something about adding a spacer with the 3711 for the linkage to clear the EGR port when using certain carbs....

But performance-wise, the 3711 & 2711 are the same.... & 3711's are everywhere. For 2711's, I've only seen 1 used one for sale over the last couple of years...

 

I know this is late, but maybe it will help someone: According to Edelbrock's site, the 2711 and 7111 are set up to accept the Carter or Edelbrock carbs. The 7111 is 2" taller than the 2711, and its best performance is in the 1500-6500 range, with a 650-800 CFM carb, as opposed to the idle to 5500 RPM range and 500-650 carb of the 2711.

The 3711 is set up to accept the Rochester Quadrajet.

 

http://www.realoldspower.com/phpBB2/...performer++rpm

 

Pretty sure both 3711 and 2711 will take square or spreadbore carbs. I have the 3711 with blockoffs on EGR and Choke ports. Holley 80457S on a 1/2 inch spacer.

 

My take on it is generally a torque converter will flash to more than the rated minimum 1500 rpm on the RPM manifold. Either one will probably work just fine. The real difference is going to be the height issue. Will it fit under the hood?

 

Exactly! When you give your car any gas at all, you are above 1500 rpms.

 

What did you ever end up doing? I relize this thread is over a year old, but I thought it'd ask. I had problems with a 1406 and the 7111 intake. Bogs, hesitations, and i re calibrated it as much as I could.

 

Old thread but what the heck, here are a couple pics of these 2 manifolds.

 

This thread helped me. thank u all

 

How hard was the install on the Caddy? Thinking about it myself. Any problem with cruise control etc?? Did u remove pollution junk? Thanks

 

I just finished a 350 with Edelbrock performer rpm aluminum heads and the 7111 intake. I am using an Olds quadrajet with an open element air cleaner with no hood clearance problems. (OAI hood). I have also tried an Edelbrock performer carb with no clearance problems.

 

Read on Jegs .says 2711 does not work with performer carbs ..wierd huh ?! I've been reading for a month on a good intake /carb combo foe my 69 oldsmobile 5.7 had the 2711 and the 1406 in my shopping cart online when I seen that now I'm at square one trying to find out if that's right ??

 

The 2711 will work with both a Rochester or an Edelbrock carb. The 3711 will only work with a Rochester carb because of the EGR. However if I remember correctly, you can use an Edelbrock carb with an adapter that raises the carb high enough for the linkage not interfere with the EGR.

http://static.summitracing.com/globa...dsfor330-4.pdf

DESCRIPTION: Performer Olds 350 intake manifolds are designed for 1966-1985 Oldsmobile 307-330-350-403 c.i.d. engines. Manifolds will fit
1980-1/2 to 1985 307 c.i.d. V8s with 5A cylinder heads (Casting #3317) ONLY. Will not fit GM Corporate 350 V8s. Manifold #3711 is a stock
replacement/street legal part for 1966-1972 (1973; Non-CA), 307, 350, and 403 engines with OEM 4bbl carburetor, and for 1972-1985, 307, 350, and
403 V8s with factory EGR and OEM 4bbl carburetor (except 1976 models with back pressure EGRs). Manifold #2711 is a stock replacement/street
legal part for 1966-1972 (1973; Non-CA), 307, 350, and 403 engines with OEM 4bbl carburetor. #2711 is designed without the EGR mounting location
in order to provide clearance for aftermarket carburetor linkages when used in non-emissions applications. #3711 will accept a factory carburetor
ONLY. Both manifolds will accept HEI distributors. Factory cruise control will not clear EGR valve on #3711 without linkage modifications. For 403
Pontiac Trans-Am, use OEM carburetor only, for Shaker Hood clearance.

 

Old thread rehashed. Get the Street Demon 625 or even the 750 version if above stock. Similar price to Edelbrock but a much better carb. Based off the AFB's(Edelbrock) replacement, the Thermoquad but is a 3 barrel all new casting design with a Aerospace polymer main body option and with the problem areas eliminated from the old Carter design. I have only seen one complaint online for this carb, everyone else loves it. It would have cost me a $100 more over refurbishment of my Qjet or I would have bought one.

 

x2, I'd suggest avoiding the 1406.

 

You can run the 1405 and 1406 on the regular performer BUT !!! you will need to bend the kickdown bracket which wont hurt its performance if you understand how the kick down works , You will also need a spacer under the carb. I ran the 1405 in my 350 for years with no issues and it worked perfect out of the box never had to jet it. The 1406 is jetted different and is more for mpg but it does have the electric choke. I actually never bought a new edelbrock carb but i bought their reman'd units from them muchs cheaper. i think reman carb have more attention to detail as they are not assembled on an assembly line. Just fwiw.

 

I've been running the 2711 with 1" 4 hole spacer with the 1406 reman carb since 2012. Just a smog stock 350 SBO . Haven't had an issue, bought a New 1406 last summer on the carb deal waiting for the reman to start sputtering. It hasn't so I have a new one on the shelf ready to go.
Copper's got me thinking about the reman carb over new now taking the assembly line into account.
I'd buy the edeldrock again and again just my experience with them.
If I had a power plant under my hood then I'd likely run something different.

 

The AFB is a crude carb with vapor lock issues, crappy non adjustable secondary door etc. The AVS has the improved secondaries at least. The Street Demon is very close to Qjet in function but the design is different. The new 3 barrel spread and square bolt pattern with the Aerospace polymer in place of old Bakelite makes it unique. Add in a bunch improvements over the Thermoquad like no more well o rings, better choke, no special tool to adjust the secondary door, bracket for the 2004R/700R4 TV cable, availabe tuning kits and even a TPS for electronic trans like the 4L60/80E, makes a very versatile option.