Hi all, I have a 79 Cutlass Supreme Calais that I pulled the 260 out of and dropped in a 350 Rocket and trans from a 72. It only had a 2 barrel carb and intake, and I'd like to go 4 barrel. I've been looking at an Edelbrock 7111 intake and a 1406 carb, but I have lots of questions

Is this a good combo?
Can anyone advise as to why a 2711 does not fit a 72 350?
What does mfr mean by 180 degree firing order? Does this require a new cam or timing?
If this is all covered in a thread somewhere, please let me know.

I know, kind of a newbie...good mechanical skills but no experience or wisdom engine builds.

Any help you can offer greatly appreciated.

Will

 

The 2711 will fit just fine. I don't know why the listing skips '72.

The 7111 may be a bit too much for a low compression engine with a factory cam.

No new cam or timing is required - I think that is referring to it being a dual plane manifold and has noting to do with the ignition.

 

The 2711 has no EGR, so technically it cannot be put on a '72 because it would eliminate the EGR and not be emissions compliant. Otherwise it will fit and work very well.
The 3711 is the same intake with EGR passages in it.
I would NOT use a 7111. It's too much intake for a stock engine. It needs cam, compression, converter, and gears to not be a lazy gas sucking pig. Give it the right stuff and it's a killer intake though.
There is nothing wrong with running an intake with EGR. It does help fuel mileage if you have everything set up right. The carburetor requirements between EGR and non-EGR are totally different except at WOT and idle. Just make sure you have the correct carb based on which intake you have.

 

Thanks Fun and Smitty, up until today, I hadn't noticed the 2711 or 3711 skipped 1972 and was set to get one or the other. I picked the 7111 because of that.

I don't think my 72 motor has EGR, I don't recall seeing any pipes from exhaust to intake or EGR valve when I swapped it. My 260 had it.

Is there a good place to get remanufactured kick-down cables? The guy that pulled the 72 trashed it and the 79 had a wierd detent cable instead of a kickdown.

Also, is the 1406 a good choice for carb?

Thanks again,

-Will

 

Personally I loath Edelbrock carbs. I've yet to see one jetted correctly, even for a SBC. For your application I would choose a Holley 1848-1. Its only 465cfm but will be very responsive and run through the entire rpm range of the stock cam.

 

1st congrats on the car. It looks to be a nice ride.
For a carb don't look past a Quadrajet. That is what GM would have used and once you get it set up correctly they are "set it & forget it".
Also, you could look for a stock cast iron four barrel intake. I've heard that you will save weight with a Performer but thlow about the same as the stock intake.

 

The only reason I didn't recommend the QJ is because it is getting harder and harder to find good cores worth building. Anyone who has known me very long at all knows I'm one of the biggest proponents of QJs there is. But the last couple of years its been hard to come by good ones. The little Holley is a really good piece right out of the box with excellent performance and fuel economy.

 

Street Demon 625 cfm. Very similar to a Qjet, an improved version of the Thermoquad with new castings.

 

Or a 600cfm Quick Fuel Slayer.

 

OK, so the lack of EGR got me thinking, is this really a 72 motor?

Casting number is 395558 2, heads are #7 not 7A, oil filler is marked 2009674,
partial vin stamp is 32Z100184. split 6 digit number on exhaust ports is 409147. From what I've read, all this points to a 72, so was there a 72 with no EGR?

Opinions please...
-Will

 

7 heads were on 71 350's. 7a were on 72 350's.

 

EGR was '73 and later.

 

Agreed. EGR started in '73; '72 would be just like a '71 except for the lil A on the heads.

 

Thanks, definitely 7 not 7A, so given a 71 or 72 non-EGR, a 2711 manifold is a good choice, right?

The 2711 does have the hot air tube well, correct?

Thanks all.

 

Ok, so I'm really confusing myself here. A 2711 is non-EGR and also lacks the choke well, whereas the 3711 has provision for both EGR and choke well, and includes block-off plates for both, right? Picture attached.

Do I have this right?

Thanks again, O wise ones

 

Yes, the 3711 Performer 350 has EGR and hot air choke ports.

Be aware that there are issues with the Edelbrock carb mounting to the Performer 350 intake.

 

Thanks, I'm leaning toward the Street Demon 625 1900 I think, lots of good reviews. Any fitment issues with this one on the 3711 that you know of?

I still can't figure why Edelbrock doesn't list the 2711 or 3711 for a 71 or 72 Olds 350, but I think I'll go for it.

Thanks again, Will

 

Go 2711 unless you get a super deal on a 3711. The egr boss might be an issue, skip it. Don't buy a drop base air cleaner, the choke sits high on that carb body. Supposedly Demon has an air cleaner just for that carb. I am seriously considering a 750 cfm version. Crazy, people are asking $100 for late 70's Qjet core.

 

yeah, it doesn't make any sense as there really isn't any difference in fit or function between the other years.

 

A 1" spacer will solve most clearance issues if running a Ebrock or Holley carb on a 3711.

 

I'd got for the 2711 and which ever 600 CFM carb you like (I prefer a 9834 Holley) as long as you get a carb with an electric choke you have no problems with the choke.
The 7111 would work fine on your engine but you will most likely have hood clearance problems.
I used a 7111 and a 9834 Holley on my completely stock 65 330 and it worked fine it improved the overall performance in all RPM's, some people here act like a 7111 is a tunnel ram with 2 4's on it and it's not.
Use what would work the best, be easiest to deal with and that would be the 2711.

 

Sorry guys, gotta revive this thread.

I never asked, but can a 410670 intake accommodate a 4 bbl carb?

I never got around to doing anything with this, loaned it out to my son. I just got it back and believe it jumped time so I'm planning on at least timing chain, head gaskets and intake manifold gasket. I figure while I'm at it I might as well see what's out there.

Engine specs are 395558 block, 409147 #7 heads, 2009674 build code on oil filler, and 410670 on intake manifold. Last time I pulled the carb, I recall seeing 2 large circular holes and 2 smaller holes.

Thanks again,

Will