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Topic: Quadrajet replacement options?

in Forum: C3 Fuel, Emission Control, and Exhaust Systems

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Quadrajet replacement options? (1/75)
3/10/10 7:32pm

Adam Wartell

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Eagleville, PA - USA

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So, I want to replace my quadrajet.

Please don't recommend rebuild, because that's been done 4 times already. I wanna get rid of it.

What are my EASIEST, CHEAPEST replacements?

Would I have to do anything other than disconnect and remove the old one and install and connect the new one exactly the same way? Would any mods have to be done to get the replacement to fit?

Can I put on a new carb that has an electronic choke? Would that make the replacement much harder?

Would something like this work?

http://www.jegs.com/i/Edelbrock/350/1406/10002/-1

Thanks!

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Quadrajet replacement options? (2/75)
3/10/10 8:20pm

dskopp
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Oak Creek, WI - USA

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Adam,

I have heard that the Edelbrock is a good replacement for the q-Jet. $300.00 is a good price for the carb, cost me more to rebuild my quadrajet on the 81. Sounds like a winner to me!!

See you in Effingham !!

Dan

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Quadrajet replacement options? (3/75)
3/10/10 8:25pm

cthulhu

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Hot Springs, AR - USA

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glad you came to realize what many of us have... qjets are a PITA..

edelbrock makes a quadrajet replacement that is pretty good.. as does holley.

the problem you have is that your stock intake limits you to the one card config without adding adapter plates and height...

this may seem backwards... but i would replace the intake with something like a performer that can take either square or spread bore.. and then replace the carb later with something like a street avenger or performer

Quadrajet replacement options? (4/75)
3/10/10 8:27pm

cthulhu

the 1406 is a good carb.. i have one on my old truck.. but it is square flange. you would need an adapter plate (yuck) to use it.

Quadrajet replacement options? (5/75)
3/10/10 8:46pm

Adam Wartell

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Ok, So, how about some specific intake and carb combo recommendations?

Thanks!

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Quadrajet replacement options? (6/75)
3/10/10 9:03pm

KDADDY79
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Dutchess County, NY - USA

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Adam,

I'd stick with a Q-Jet. It'll go right on. No other changes necessary.

Check with some sponsors here or take a look at www.summitracing.com They have a rebuilt 750 CFM Q-Jet to replace yours for $300.00

Keep us posted.

Kevin

Quadrajet replacement options? (7/75)
3/11/10 12:56am

cthulhu

a performer or performer air-gap (check clearance diagram)

http://www.edelbrock.com/automotive_new/mc/manifolds/manifolds_main.shtml

and the aforementioned 1406

you probably have a rather pedestrian stock cast-iron manifold on it right now.

Quadrajet replacement options? (8/75)
3/11/10 6:18am

manchestershark

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Equinunk, PA - USA

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Sounds to me like the person re-building the Q-Jet did not get it right. I like mine, works great. What issues are you having to want to change it?

BTW, If anyone has or knows of a Q-jet with # 7042203 on it, I am interested. The carb junkies site has yet to get back to me. THANKS

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Quadrajet replacement options? (9/75)
3/11/10 6:49am

Gunslinger
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Frederick, MD - USA

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If you're determined to get rid of your Q-jet, I agree with the others on getting an Edelbrock...they're very simple to adjust and hold their adjustments. My own suggestion would be to get an Edelbrock 1406 on a Performer EPS intake manifold or a standard Performer intake. The EPS is optimized specifically for their square-bore carburetors and has somewhat better torque and horsepower numbers than the Performer which is for both square- and spread-bore carbs.

A couple of things to keep in mind if changing to an Edelbrock, is you'll have to change the fuel line from the fuel pump to the carb inlet plus you'll need an in-line fuel filter...neither a big deal. If your car has a/c, you'll also need Edelbrock's proprietary a/c idle kick-up solenoid, which is a bit pricey. It all adds into the total cost of the conversion. You'll probably have to get an adapter bracket for the throttle cables (and cruise-control if you have it)...again, not expensive but has to be figured in.

I think you'll be quite pleased with the change. I would personally prefer to keep the Q-jet, but this combination is an excellent alternative to go with.

Quadrajet replacement options? (10/75)
3/11/10 6:50am

Redwingvette

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I have the Edelbrock Performer intake with the Holley 4175 carb. Nothing fits like the original stuff but every year is different.

The thing to remember is that you still will need to retune the new carb for you motor and drive train. Nothing out of the box is going to be tuned correctly for every appilcation.

Not trying to scare you and I know what you mean about being tired of paying good money after bad to get the Q-jet fixed. Lots of folks out there think they can rebuild them but all they do is mix&match parts and make it worse.

Good luck.

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73 coupe L48, Flat-top pistons, Performer RPM Heads, Crane Cam and roller rockers, Holley 650 vac sec. Performer intake,
3.55 gear BTO 200-4R trans,
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Quadrajet replacement options? (11/75)
3/11/10 7:27am

Adam Wartell

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[QUOTE=Gunslinger]....

[/QUOTE]

Ok, so it sounds like I need a new intake manifold and I know where I can get a new "Model 2101 SBC Performer Intake manifold" at a good price. So next is a carb to match. Perhaps the Edelbrock 1406?

However, Gunslingers tips above scare me. I can certainly remove the old carb and intake no problem. I could likely attach the new intake and carb no problem... its the connecting everything part that has got me worried now. How/where could I find step-by-step instructions on how to do this?

Thanks guys!

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Quadrajet replacement options? (12/75)
3/11/10 7:38am

my7t1

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Dorr, MI - USA

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I run a Holley 650 on a Performer 2101. Its a low rise manifold and gives me plenty of hood clearance. I did have to put an adaptor to change the bore. The only problem I ran into was I had to lengthen the choke linkage to reach the stovepipe. It should be no problem hooking up elec. choke. I just haven't gotten around to it yet. I also had my Quad rebuilt, but I didn't get the performance that I get from the Holley. I don't think it was the carb as much as just not being able to get it dialed in. My feelings are all three carbs are decent. The secret is like Brian says, getting em adjusted right.
My .02 "T"

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Quadrajet replacement options? (13/75)
3/11/10 7:44am

Gunslinger
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Take pics of everything before you start and tag every cable and hose with what they're for. That way you'll be able to know where each gets hooked up to on a new carburetor/intake combination. The Edelbrock carburetor manual tells you what port is which, etc. It's not difficult. The electric choke on the 1406 needs its hot wire attached to a power source...connect it to a source on the "run" side of the ignition, not a source that's always hot or attached to the "accessory" side of the switch.

The toughest part will probably be the new gas line. It's easier to access the line from the fuel pump from under the car, unless you simply cut the line and flare it and run rubber fuel line. Edelbrock also sells a fuel line made specifically for a small block Chevy from the fuel pump to the carb inlet with connections for an in-line fuel filter. That makes for a very professional looking installation.

None of this is tough...if I did it with my clumsy big hands, you can. Besides...they're only knuckles...bust one and you have nine more!

Quadrajet replacement options? (14/75)
3/11/10 8:07am

Adam Wartell

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[QUOTE=Gunslinger]Take pics of everything before you start and tag every cable and hose with what they're for. That way you'll be able to know where each gets hooked up to on a new carburetor/intake combination. The Edelbrock carburetor manual tells you what port is which, etc. It's not difficult. The electric choke on the 1406 needs its hot wire attached to a power source...connect it to a source on the "run" side of the ignition, not a source that's always hot or attached to the "accessory" side of the switch.

None of this is tough...if I did it with my clumsy big hands, you can. Besides...they're only knuckles...bust one and you have nine more!

[/QUOTE]

I appreciate all this advice. Now, not to sound completely helpless, but could you point me to all these parts that you are talking about on Edelbrock's (or some vendor's) website? That way I'd know I'm getting the exact stuff you are talking about.

As mentioned, I'd like to start with the "Model 2101 Performer Intake manifold" as my base. Since I can get a new one very cheaply.

Thanks!

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Quadrajet replacement options? (15/75)
3/11/10 11:50am

Gunslinger
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The Edelbrock number for the fuel feed line is 8126 without a filter and 8131 with a filter. With these you can simply cut and flare your old fuel line and add flexible fuel line. Summit Racing may well have equivalent parts under their own name for less, plus they sell the Edelbrock parts as well.

Summit also sells the throttle/cruise control/transmission kickdown cable brackets as well...under their name and Lokar as well.

The Edelbrock a/c idle compensator is part #8059.

Quadrajet replacement options? (16/75)
3/11/10 4:28pm

ebo

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Heh wildman, I done saw you change a distributer 15 times in 15 minutes, you can handle this. Do you have a flaring tool?

ebo

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ebo

Quadrajet replacement options? (17/75)
3/11/10 6:17pm

indy99
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I was just on the Edelbrock site and they have reconditioned 1406 carbs for $235.95. Saves you some bucks there. http://store.edelbrock.com/9906.aspx

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Quadrajet replacement options? (18/75)
3/11/10 6:28pm

SilverStreak

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Oceanside, CA - USA

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About 6 years ago my QJet was leaking so had to get a new one. Went with Edelbrock and havn't had any problems and it was a unbolt old one and bolt on new one. Everthing hook up the same as the factory one. If you have any questions call Edelbrock they are more than helpful.

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Quadrajet replacement options? (19/75)
3/11/10 7:33pm

Gunslinger
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Edelbrock doesn't sell their Q-jets anymore. It's been several years since they dropped them from their catalog and sold off the remaining units at a discount some time ago. I've heard the tooling was scrapped but I have no confirmation of that.

All I can guess is the market for new Q-jets wasn't there, or if the tooling was destroyed, that pretty much makes the decision for them to stop listing them.

Quadrajet replacement options? (20/75)
3/11/10 8:18pm

Adam Wartell

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[QUOTE=ebo]Heh wildman, I done saw you change a distributer 15 times in 15 minutes, you can handle this. Do you have a flaring tool?

ebo

[/QUOTE]

That's cause I had more experienced men show me how to do it 12 times first.

A no, no flaring tool.

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Quadrajet replacement options? (21/75)
3/11/10 9:30pm

tuxblacray

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Ive had the Holley 650 as Terry mentioned. It is a straight bolt on unit to the Performer. Its pretty siimple and Holley has made a bazillion of them. My 1st 1 was on my 67 Camaro in 1973.

So what is gonna happen to the old Q-jet?

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Quadrajet replacement options? (22/75)
3/12/10 4:22am

JimG

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I have a Demon Carb. They call them "Holleys that work". Love mine.

Just sayin'.

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JimG2010-03-12 04:23:38

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Quadrajet replacement options? (23/75)
3/12/10 5:53am

KeBo
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Kendall Park, NJ - USA

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I had my q-bog rebuilt 3x by 2 different people. It was bench tested before install. This carb just stinks. I changed to an E-brock performer and 650 carb. The 81 really woke up AND you can close the hood. I also changed the airfilter assm, valve covers and de-smogged as long as I was there.

Quadrajet replacement options? (24/75)
3/12/10 9:28am

Adam Wartell

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So, these guys match up, right?

http://www.jegs.com/i/Edelbrock/350/2101/10002/-1?CT=999

http://www.jegs.com/i/Edelbrock/350/1406/10002/-1

What do I need to know? What other parts will I need? etc.

Thanks!

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Quadrajet replacement options? (25/75)
3/12/10 11:33am

Adam Wartell

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Did someone say I'm gonna need one of these?

JEGS 157313 - JEGS Throttle, TV Cable and Extension Brackets

JEGS 157301 - JEGS Throttle, TV Cable and Extension Brackets

If so, how do I know which one I need?

Do I also need this thing?

http://www.jegs.com/i/JEGS/555/15225/10002/-1

Thanks.

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Quadrajet replacement options? (26/75)
3/12/10 11:57am

Adam - I am 99% sure thats it. The little stuff, the speed shop handled that at install..

Quadrajet replacement options? (27/75)
3/12/10 12:30pm

tuxblacray

SEE NEXT POST..........

Tuxblacray2010-03-12 13:24:11

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Quadrajet replacement options? (28/75)
3/12/10 12:44pm

tuxblacray

intake
intake gasket kit
waterneck gasket
gasket sealer
carburetor
carburator gasket
return spring - optional (you have one) I replaced w/chrome
automatic choke assembly - optional (you have one)
air cleaner assembly (not sure if OEM still fits) I replaced w/aftermarket
air cleaner elementTuxblacray2010-03-12 12:49:31

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Quadrajet replacement options? (29/75)
3/12/10 1:05pm

indy99
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No need to stutter Tux. Smile

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Quadrajet replacement options? (30/75)
3/12/10 1:24pm

Adam Wartell

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Ok, so here is what I think I need:

Intake: http://www.jegs.com/i/Edelbrock/350/2101/10002/-1?CT=999

Carb: http://www.jegs.com/i/Edelbrock/350/1406/10002/-1

Intake gasket: http://www.jegs.com/i/Edelbrock/350/7201/10002/-1

Automatic Transmission Kickdown Stud (Do I need this?) http://www.jegs.com/i/Edelbrock/350/8018/10002/-1

Throttle Cable Adapter Stud http://www.jegs.com/i/Edelbrock/350/8009/10002/-1

Carb studs: http://www.jegs.com/i/Edelbrock/350/8008/10002/-1

Intake bolts: http://www.jegs.com/i/Edelbrock/350/8504/10002/-1

Dual Throttle Return spring (Do I need this?) http://www.jegs.com/i/JEGS/555/15225/10002/-1

Air Cleaner that they are giving away: http://www.bigcarbdeal.com/

They're air cleaner doesn't see to sit inside a housing. My current one does. What do I do with the things that connect to my current air cleaner housing?

I'm excited but scared I won't know what the heck I'm doing.

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Quadrajet replacement options? (31/75)
3/12/10 1:29pm

tuxblacray

[QUOTE=indy99] No need to stutter Tux. Smile

[/QUOTE]

HUH?

Actually my whole system took a super dump..... it was the biggest clasp of lightning of have ever heard. (somewhere there is a Firebird burning........)

So... I reposted not knowing the original went through.

How'd ya like me fix?

Anyway let's get Adam fixed up.........

Tuxblacray2010-03-12 13:32:07

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Quadrajet replacement options? (32/75)
3/15/10 6:12am

Adam Wartell

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So, there was a ton of activity on this thread when I first posted it. Now I have a shopping list and need confirmation from you fine folks if my list is accurate and all-inclusive, and I haven't gotten any replies.

Can anyone tell me if my list above is the one I should go with? I wanna place the order.

Thanks!

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Quadrajet replacement options? (33/75)
3/15/10 7:32am

Gunslinger
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Adam...

Your list seems pretty complete though there always seems to be little things we all forget. Get a tube of silicone sealer...if I remember correctly, Edelbrock's instructions say to use that at the rear of the intake rather than use a gasket. The instructions will tell you which they recommend.

The air cleaner may not fit without a drop base, so you can always re-use your original and sell the free one on Ebay if nothing else. If you do use the Edelbrock air cleaner, there's probably a punch out area on the bottom to run an EGR hose to, but the 2101 Performer manifold is a non-EGR intake anyway.

Quadrajet replacement options? (34/75)
3/15/10 11:43am

Adam Wartell

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Ordered!

Order Summary

Qty	Part Number	Price	Total
1	350-1406 Detail	$274.99	$274.99
1	350-7201 Detail	$15.99	$15.99
1	350-8018 Detail	$3.69	$3.69
1	350-8009 Detail	$3.99	$3.99
1	350-8008 Detail	$4.99	$4.99
1	350-8504 Detail	$14.99	$14.99
1	375-1604 Detail	$31.99	$31.99

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Quadrajet replacement options? (35/75)
3/15/10 7:10pm

JC VETTE 70
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When I purchased my car it had a edelbrock on it with a performer intake, it always ran rich,rebuilt once and still ran rich. I have a old school mechanic that works on my car, that has been in the business for years, told me to get rid of that junk and purchase a new Q-jet that originally came with the car. I ordered a new 750cfm from jet performance, once it was installed i could not believe the difference. Big smile

He had always worked with these carbs and told me if they are properly tweeked, they are very good carbs.

I think it all comes down to is how all these carbs are set, you really need to know what you are doing.

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Quadrajet replacement options? (36/75)
3/15/10 7:48pm

cthulhu

make sure you put some silicone on your intake bolts.

Quadrajet replacement options? (37/75)
3/16/10 7:07am

Adam Wartell

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Eagleville, PA - USA

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Used to own a 1979 Corvette now owned by JB79

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[QUOTE=JC VETTE 70]When I purchased my car it had a edelbrock on it with a performer intake, it always ran rich,rebuilt once and still ran rich. I have a old school mechanic that works on my car, that has been in the business for years, told me to get rid of that junk and purchase a new Q-jet that originally came with the car. I ordered a new 750cfm from jet performance, once it was installed i could not believe the difference. Big smile

He had always worked with these carbs and told me if they are properly tweeked, they are very good carbs.

I think it all comes down to is how all these carbs are set, you really need to know what you are doing.[/QUOTE]

NOW you tell me! LOL

Well, too late. Stuff will be here tomorrow. Maybe start the install this weekend. Thumbs Up

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-Adam Wartell
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Quadrajet replacement options? (38/75)
3/16/10 7:07am

Adam Wartell

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[QUOTE=cthulhu]

make sure you put some silicone on your intake bolts.

[/QUOTE]

Yeah, I'm gonna have to somehow remember to pick up that and some 3/8" fuel line hose and in-line fuel filter.

What is the purpose of the silicone?

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-Adam Wartell
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Quadrajet replacement options? (39/75)
3/16/10 8:43am

my7t1

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Dorr, MI - USA

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71 Colonnade Hardtop Coupe Torch Red with black interior originally L48 built to push around 360hp

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Good tip from Ben, Adam. The silicone or permetex will keep the oil from seeping through the bolt holes.
Hey, if ya wanna send me a flight ticket I'd be glad ta come up and help ya.

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Quadrajet replacement options? (40/75)
3/16/10 9:06am

Adam Wartell

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Yeah, how come none of you wrenches live close by!?

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-Adam Wartell
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Quadrajet replacement options? (41/75)
3/16/10 10:33am

Adams' Apple

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Duncanville, TX - USA

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#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

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Quadrajet replacement options? (42/75)
3/16/10 1:34pm

Gunslinger
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Frederick, MD - USA

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1969 convertible L71 427/435 4-speed black interior

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Adam...don't worry about the Edelbrock carb...it is an excellent carburetor. Depending on other things...like the cam specs in your engine, there's a possibility any carb might need re-jetting to match it. I had that happen in the '78 L82 I used to own...I put on an Edelbrock Performer intake with the stock Q-jet which had been rebuilt to stock specs. It turned out that some previous owner had installed a different cam and the car wouldn't idle well at all. The carb was re-jetted the carb and no more problems.

If you have a stock engine with no other changes, the 1406 should work well as-is with no problems.

The Q-jet is really an excellent carb, but they really do have to be set up by someone who understands them (and I'm not of them!). Also...outside of the discontinued Edelbrock Q-jets, they've been out of production for quite some time and can only be rebuilt so many times before they're simply worn out. Finding good cores for a Q-jet is problematic no matter how many speed catalogs list them from rebuilders...the Q-jet was used in so many applications and versions it's difficult to find on that will bolt on and go without being set-up for that particular car. At that point, it's generally easier to simply buy a new carburetor.

Quadrajet replacement options? (43/75)
3/16/10 2:13pm

Adam Wartell

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My engine is not stock. It is a GM Crate Motor...350.

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-Adam Wartell
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Quadrajet replacement options? (44/75)
3/16/10 5:03pm

Per4mance

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Morganville, NJ - USA

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Adam just dop the car off here in New Jersey and let me at it I'll show you how to make a Q- jet work.I play all year with them at the marinia and I had some really bad ones.I have a machine shop at my disposal so I can rebore and sleave the throttle rods Let me know and give me a call...Bill

Quadrajet replacement options? (45/75)
3/16/10 6:42pm

wetvet
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Lake Oswego, OR - USA

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1972 Steel Cities Gray T Top. Original Owner, Original Paint and Interior. The running gear has been rebuilt. only 250,000 miles on the clock..

Joined: 10/17/2003
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Power Block TV this weekend shows how to rebuild a Q-jet.
http://www.powerblocktv.com/site3/

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Quadrajet replacement options? (46/75)
3/16/10 7:38pm

cthulhu

[QUOTE=Adam Wartell]

He had always worked with these carbs and told me if they are properly tweeked, they are very good carbs.

I think it all comes down to is how all these carbs are set, you really need to know what you are doing.[/QUOTE]

NOW you tell me! LOL

Well, too late. Stuff will be here tomorrow. Maybe start the install this weekend. Thumbs Up

[/QUOTE]

anecdotally you can always find someone who had better luck with something. Qjet has a pretty bad rep. Also.. I dont know why but I think their CFM is overrated.

From my days adt working at a speed shop I can tell the the number one cause of carbs not running right, runnign rich, stumbling off idle etc is that people bought carbs WAY TOO BIG for their engine. A 750 CFM carb is just right for a well tuned 427. It is way too big for a mild mannered 350.

Quadrajet replacement options? (47/75)
3/16/10 7:40pm

cthulhu

[QUOTE=Adam Wartell]Yeah, how come none of you wrenches live close by!? [/QUOTE]

it is not our fault you dont have the good sense to live in God's country! Wink

Quadrajet replacement options? (48/75)
3/17/10 6:44am

Adam Wartell

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Eagleville, PA - USA

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[QUOTE=Per4mance]Adam just dop the car off here in New Jersey and let me at it I'll show you how to make a Q- jet work.I play all year with them at the marinia and I had some really bad ones.I have a machine shop at my disposal so I can rebore and sleave the throttle rods Let me know and give me a call...Bill [/QUOTE]

Well, I won't have a q-jet for you to tune, but I may take you up on the offer to tune my new edelbrock setup, if you have the knowledge, time and are willing. Big smile

Of course, that is if I can get it running enough to bring it to you.

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-Adam Wartell
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My first Vette, now owned by JB79:

Quadrajet replacement options? (49/75)
3/17/10 6:08pm

Per4mance

Adam, Bring all your parts and I'll do the whole job for you and save you the headaches and it will be done right no short cuts you will be more than happy....Bill

Quadrajet replacement options? (50/75)
3/18/10 6:44am

Adam Wartell

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Eagleville, PA - USA

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Used to own a 1979 Corvette now owned by JB79

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[QUOTE=Per4mance]Adam, Bring all your parts and I'll do the whole job for you and save you the headaches and it will be done right no short cuts you will be more than happy....Bill [/QUOTE]

I appreciate the offer but you're about 2 hours away. Think I might still tackle it myself.

Thanks.

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-Adam Wartell
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My first Vette, now owned by JB79:

Quadrajet replacement options? (51/75)
3/20/10 8:05am

Adam Wartell

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Eagleville, PA - USA

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Right off the bat, I have an issue. There is a paper that came with the carb that says: "Before removing your old carb, determine if the vacuum port is timed (no vacuum at idole) or full (vacuum present at idle)."

Do any of you have an answer for that, or do I actually have to get it running and warmed up to pull the line off to check it? Is it the line in the front of the q-jet that is all the way to the drivers side?

Also in this picture, there is a metal line going from the back of the carb to the intake. The 1406 does not have a spot for this line to connect. Will I no longer need it?

In this picture, there is a rubber line with a little black/yellow plastic piece on it...it connects to the front of the q-jet and to the thermostat housing. Will I no longer need this with the 1406? What will I do with the open port on the valve it connects to on the thermostat housing?

Lastly, there is a metal line that goes from the rich/lean dial to the same place on the intake as the other metal line mentioned above. Again, no place for the for the 1406. Is that because the 1406 has an electric choke? What will I be doing with the port on the intake if neither of those metal lines will be going there anymore?

Thanks!

Adam Wartell2010-03-20 08:39:01

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-Adam Wartell
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My first Vette, now owned by JB79:

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