Carb replacement
June 2nd, 2020, 04:18 PM
#4
CH3NO2 LEARN IT BURN IT
Join Date: Jul 2010
Location: Land of Taxes
Posts: 4,934
Edelbrock AVS2 1900 series is a good alternative. Extremely tunable if you follow the instructions have the patience to super tune and buy the large spring rod and jet kit.
A good rebuild on the existing QJet is another good choice. It is more or less already tunned for the car if its the original carb.
Regardless, any carb will need to be tuned to the car. No carb will be 100% right directly out of the box
A good rebuild on the existing QJet is another good choice. It is more or less already tunned for the car if its the original carb.
Regardless, any carb will need to be tuned to the car. No carb will be 100% right directly out of the box
June 2nd, 2020, 04:37 PM
#5
Registered User
Join Date: Feb 2013
Location: Phoenix, AZ
Posts: 14,152
Don't expect that an aftermarket carb will increase the engine's performance. It might if your current one has issues and the new one is tuned properly, but then again if the current one has issues then it can be corrected to operate properly.
June 2nd, 2020, 10:54 PM
#8
Registered User
Thread Starter
Join Date: Dec 2019
Location: london Uk
Posts: 26
Hi thanks for the replies was intending to change for better cold start system and a more easily tunable carb ie holley/edlbrock, don't think the secondaries are functioning correctly
June 3rd, 2020, 04:44 AM
#9
Registered User
Join Date: Jan 2010
Posts: 2,015
Take the money you would invest in a new carb, and then rebuild the Q-jet. And then you'll have your carb and can easily tune it for YOUR engine. Or send it to a reputable builder and have them rebuild it. You'll be miles ahead. Q-jets aren't that difficult to work on, IMO.
Or you could buy one of those Flea-brocks and spend eternity under the hood fiddling around with that thing, adapting it to fit, messing with linkages, etc. Good luck with that. It's a personal choice to buy a new carb, and one I wouldn't make unless the Qjet is goobered up beyond repair. But if you like that sort of thing, it's up to you.
Or you could buy one of those Flea-brocks and spend eternity under the hood fiddling around with that thing, adapting it to fit, messing with linkages, etc. Good luck with that. It's a personal choice to buy a new carb, and one I wouldn't make unless the Qjet is goobered up beyond repair. But if you like that sort of thing, it's up to you.
June 3rd, 2020, 05:09 AM
#10
Registered User
Join Date: Apr 2017
Location: Northeast Florida
Posts: 353
Edelbrock AVS2 1900 series is a good alternative. Extremely tunable if you follow the instructions have the patience to super tune and buy the large spring rod and jet kit.
A good rebuild on the existing QJet is another good choice. It is more or less already tunned for the car if its the original carb.
Regardless, any carb will need to be tuned to the car. No carb will be 100% right directly out of the box
A good rebuild on the existing QJet is another good choice. It is more or less already tunned for the car if its the original carb.
Regardless, any carb will need to be tuned to the car. No carb will be 100% right directly out of the box
June 3rd, 2020, 10:47 AM
#12
CH3NO2 LEARN IT BURN IT
Join Date: Jul 2010
Location: Land of Taxes
Posts: 4,934
Cliff Ruggle and a few others I would entrust to rebuild a QJet. The only problem is most rebuilders have long lead times, weeks.
Once its rebuilt and tunned you won't have to touch it again for years.
Choices:
Get a new QJet quickly and spend a little time properly tuning it, with a vacuum gauge. Not hard to do.
Get another brand spend time tuning and adapting the fuel line and accelerator linkage. Harder to do.
Get the current one rebuild...long lead time...winter project. Easiest.
Learn how to do this yourself if you're handy, patient, and enclined. Not recommended if you don't possess these attributes.
https://cliffshighperformance.com/
Once its rebuilt and tunned you won't have to touch it again for years.
Choices:
Get a new QJet quickly and spend a little time properly tuning it, with a vacuum gauge. Not hard to do.
Get another brand spend time tuning and adapting the fuel line and accelerator linkage. Harder to do.
Get the current one rebuild...long lead time...winter project. Easiest.
Learn how to do this yourself if you're handy, patient, and enclined. Not recommended if you don't possess these attributes.
https://cliffshighperformance.com/
June 3rd, 2020, 12:26 PM
#13
Registered User
Join Date: Sep 2017
Location: St. Paul Minnesota
Posts: 4,135
June 4th, 2020, 06:58 AM
#15
Old(s) Fart
Join Date: Mar 2007
Location: Northern VA
Posts: 47,693
The original carb didn't have cold start problems nor secondary problems when it left the factory. Rebuilding it will be much less expensive, it won't require re-engineering of the throttle linkage, and it won't require adapters. The original carb will also already be tuned to the needs of your engine - any aftermarket carb will be tuned to the needs of a generic Chevy 350 out of the box. I fail to understand why people always think that a new one-size-fits-all carb will be better than a properly maintained original on an otherwise stock engine. Certainly if the engine is modified, there's a reason for a change, but on a stock engine there isn't. And frankly, how much "tuning" do you plan to do?
June 4th, 2020, 07:52 AM
#16
Head Floor Sweeper
Join Date: May 2020
Location: Athens, AL
Posts: 37
The original carb didn't have cold start problems nor secondary problems when it left the factory. Rebuilding it will be much less expensive, it won't require re-engineering of the throttle linkage, and it won't require adapters. The original carb will also already be tuned to the needs of your engine - any aftermarket carb will be tuned to the needs of a generic Chevy 350 out of the box. I fail to understand why people always think that a new one-size-fits-all carb will be better than a properly maintained original on an otherwise stock engine. Certainly if the engine is modified, there's a reason for a change, but on a stock engine there isn't. And frankly, how much "tuning" do you plan to do?
If you choose to go with an aftermarket carb, be aware that it will require considerable fiddling to make it perform properly in all phases of operation.
Travis
June 4th, 2020, 10:04 AM
#17
Registered User
Join Date: Sep 2017
Location: St. Paul Minnesota
Posts: 4,135
I think many people believe myths. They also think that "new technology" (carbs,cams,etc.) is better. Because they don't understand something like how a Quadrajet works or how to troubleshoot, they buy something (carb) to fix a problem they are not completely sure of. They assume, bolt it on and everything will be wonderful.
June 4th, 2020, 10:45 AM
#18
Registered User
Join Date: Aug 2013
Posts: 148
If your good with tackling one on your own. Cant say enough about the parts and knowledge that come from Cliff. I have only had a half dozen projects where I dealt with him, but top notch all the way.
pick up a copy of his book. Read. Re-read. As many times as needed. Like it was said before, if you know EVERYTHING that your setup consists of, call him.
his parts are the best I have used and he will help with any mods you may need. The parts you get will be right the first time. A side note. Not sure if your carb falls in this era, but some of the early Olds carbs were problematic. If you search for a core from a later(77-80) Olds, they would be a good place to start as well.
pick up a copy of his book. Read. Re-read. As many times as needed. Like it was said before, if you know EVERYTHING that your setup consists of, call him.
his parts are the best I have used and he will help with any mods you may need. The parts you get will be right the first time. A side note. Not sure if your carb falls in this era, but some of the early Olds carbs were problematic. If you search for a core from a later(77-80) Olds, they would be a good place to start as well.
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