Carb question
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From: Talladega Alabama
Carb question
I am restoring a 69 SB and need to replace the carb. The one on it is a Q-jet but not the original. It's a piece of @#$%. Just wondering what route I should take. Find the correct Q-jet or just go with something else.
This is a driver so numbers are not important to me.
Any specific recommendations? If so, what and where can I get it.
Thanks!
This is a driver so numbers are not important to me.
Any specific recommendations? If so, what and where can I get it.
Thanks!
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Joined: Oct 2007
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From: Talladega Alabama
I am wondering about the vacuum connection on the carb. I was thinking that the vacuum connected to it. Is that right or I am totally off base. That's why I was asking about what the alternatives would be. Sorry for limited knowledge but I am just getting into this.
Team Owner
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From: Crossville TN
There is another thread on this Forum right now that speaks to the Q-jet question. A Q-jet is a Q-jet. Edelbrock made them for a while after Rochester went out of business, as they bought the business and all of the tooling. The Q-jet is a good carb...IF it is set up properly. Vacuum is generated in the intake manifold as a function of the cylinders drawing in air/fuel mixture; the ports on the carb [all carbs] are to supply that vacuum to other accessories.....power brakes, C3 wiper door & headlight system, etc. My recommendation is to get the carb you have rebuilt and set-up properly. Check out the other thread for detailed info.
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From: Talladega Alabama
Thanks for the info. I like the "direct bolt on with no mods" comment from capevettes.
Where can I get the best price on the 650?
One other question....you specified mechanical secondaries. Any particular reason?
Where can I get the best price on the 650?
One other question....you specified mechanical secondaries. Any particular reason?
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Joined: Oct 2004
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From: Cape Cod, Mass.
2025 C6 of the Year Finalist - Unmodified
2025 C8 Z06/7/E-Ray of the Year Finalist - Unmodified
2023 C3 of the Year Finalist - Unmodified
2021 C8 of the Year Finalist Unmodified
2020 Corvette of the Year Finalist (performance mods)
2019 C1 of Year Winner (performance mods)
2017 Corvette of the Year Finalist
2016 C2 of Year
2015 C3 of Year Finalist
Drifting
Joined: Sep 1999
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Just remember unless you have a BB or LT1 hood you won't get the stock hood to close with the holley. Long thread on this as well not long ago
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Racer
Joined: Mar 2006
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From: SAN CLEMENTE CALIFORNIA
I am restoring a 69 SB and need to replace the carb. The one on it is a Q-jet but not the original. It's a piece of @#$%. Just wondering what route I should take. Find the correct Q-jet or just go with something else.
This is a driver so numbers are not important to me.
Any specific recommendations? If so, what and where can I get it.
Thanks!
This is a driver so numbers are not important to me.
Any specific recommendations? If so, what and where can I get it.
Thanks!
But I think you would be better off using a q jet (one that matchs your car. hollys use a lot more gas.....
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From: Talladega Alabama
Thank you Dennis!!! That was a VERY important point. You saved me. Now I am back to where I was....unsure of what to do.
Are there any direct bolt on q-jet replacement Holley carbs (or others) that would be an alternative? My 69 is a SB 350ci 350hp 4sp.
If I wanted to go back with the correct q-jet, where is a good source to buy one?
Are there any direct bolt on q-jet replacement Holley carbs (or others) that would be an alternative? My 69 is a SB 350ci 350hp 4sp.
If I wanted to go back with the correct q-jet, where is a good source to buy one?
Drifting
Joined: Jul 2006
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From: Deplorableville Nebraska
I currently have 3 '70 350/350 L46 cars. I have had very good success finding '69 7029207 (correct for '69) carbs on that auction site to fill in for 2 of my cars while I look for the correct carbs (7040207). Just do a search on 7029207 on that auction site both for sale, and completed listings to get an idea on whats out there. DO NOT buy a core that has been rebuilt. Get a good core, and send it to Lars to be rebuilt. He does fabulous work!
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From: Talladega Alabama
I got the numbers off the q-jet that is on there now. It is 7043240. I think that's a '73 Buick 455 carb.
Is this one worth spending the time and money to get it rebuilt?
Still looking for a holley/eddlebrok direct bolt on alternative if there is one.
I'll also check out that auction site to see about the correct 7029207 carb.
Is this one worth spending the time and money to get it rebuilt?
Still looking for a holley/eddlebrok direct bolt on alternative if there is one.
I'll also check out that auction site to see about the correct 7029207 carb.
Drifting
Joined: Dec 2002
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From: Long Beach CA
Holleys use a lot more gas? An engine requires X amount of gas to run. If your Holley is set up too rich, it will use more gas than a Q-jet that is set up lean........and vice versa.
Fuel mileage is much a function of how you drive than the carb you use, provided the carb is set up to work correctly with your engine.
Fuel mileage is much a function of how you drive than the carb you use, provided the carb is set up to work correctly with your engine.
Racer
Joined: Mar 2005
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From: Jacksonville FL
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From: Talladega Alabama
If I go back with the stock q-jet, I shouldn't have any hood clearance issues with the air cleaner, should I???????
Also, not sure what you mean by mechanical sec being a kick in the rear. I am a little slow....
Also, not sure what you mean by mechanical sec being a kick in the rear. I am a little slow....
Drifting
Joined: Sep 1999
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No hood issues with a Q-jet.
The kick in the rear is more of a a lag or bog in transition from the primary to the secondaries when you mash the gas petal, seeming like acceleration IMO
The Q-jet set up properly has a nice smooth transition to the secondaries, which are vacuum operated.