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Topic: Quadrajet replacement options?

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

Quadrajet replacement options?

Posted: 3/10/10 7:32pm Message 1 of 75
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Eagleville, PA - USA
Joined: 11/1/2001
Posts: 18378
Vette(s): Used to own a 1979 Corvette now owned by JB79
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?  

Thanks!




-Adam Wartell
NCM Lifetime Member #1222
Founder: C3 Vette Registry 
C4 Vette Registry, C6 Vette Registry

My first Vette, now owned by JB79:

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Quadrajet replacement options?

Posted: 3/10/10 8:20pm Message 2 of 75
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Oak Creek, WI - USA
Joined: 5/21/2008
Posts: 1965
Vette(s): 1981 Great White Shark. Red Interior, 350/190 hp. PS, PB (SS), A/C CC, T-Tops. Served three years in Active Duty Army, then Retired Air Force after 34 years! Badger State Vettes Car Club. 175,000 Original miles!! Now own a 1998 C-5!
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



Quadrajet replacement options?

Posted: 3/10/10 8:25pm Message 3 of 75
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Hot Springs, AR - USA
Joined: 4/24/2004
Posts: 3236
Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans
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?

Posted: 3/10/10 8:27pm Message 4 of 75
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Hot Springs, AR - USA
Joined: 4/24/2004
Posts: 3236
Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans
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?

Posted: 3/10/10 8:46pm Message 5 of 75
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Eagleville, PA - USA
Joined: 11/1/2001
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Vette(s): Used to own a 1979 Corvette now owned by JB79
Ok, So, how about some specific intake and carb combo recommendations?

Thanks!



-Adam Wartell
NCM Lifetime Member #1222
Founder: C3 Vette Registry 
C4 Vette Registry, C6 Vette Registry

My first Vette, now owned by JB79:

Quadrajet replacement options?

Posted: 3/10/10 9:03pm Message 6 of 75
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Dutchess County, NY - USA
Joined: 8/27/2007
Posts: 2484
Vette(s): White '79 Corvette. It's a driver.

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?

Posted: 3/11/10 12:56am Message 7 of 75
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Hot Springs, AR - USA
Joined: 4/24/2004
Posts: 3236
Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans
a performer or performer air-gap (check clearance diagram)
 
 
and the aforementioned 1406
 
you probably have a rather pedestrian stock cast-iron manifold on it right now.
 



Quadrajet replacement options?

Posted: 3/11/10 6:18am Message 8 of 75
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Equinunk, PA - USA
Joined: 10/31/2007
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Vette(s): 1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.
 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



Quadrajet replacement options?

Posted: 3/11/10 6:49am Message 9 of 75
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Frederick, MD - USA
Joined: 9/8/2003
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Vette(s): 1969 convertible L71 427/435 4-speed black interior
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?

Posted: 3/11/10 6:50am Message 10 of 75
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Waterford, MI - USA
Joined: 9/13/2002
Posts: 1749
Vette(s): 1973 Red coupe

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.
 



Brian - NCM Lifetime Member

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,
Leather seats, Seatbelt Plus 3point seatbelts, Pioneer CD player
Magnaflow Exhuast System

Dewitt radiator and dual electric fans
Borgeson Steering box
 


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


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