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is the Edelbrock Performer Series 750 CFM Carburetor with Manual Choke able to replace the quadrajet without issues?
Would this carb need a spacer for very hot weather? here it can be more than 98deg.
For the valve cover breather that returns to the quadrajet air filter, i need to replace with another type of valve breather?
What will i do with the metal tube going from the airfilter to the driver side header?
With a new setup should i close the EGR? The next step will be to get new headers.
Ive done some gasket replacement work on my C3, 1974 L-48 5.7L 350 sb. Im ready to upgrade my carb to something with more performance and that can also handle the spanish heat. Today it is over 98 deg. I have the stock quadrajet setup. Ive been looking at this carb, and would like to know if its worth buying.
Also what other changes i need to. make for this upgrade. In the original setup there is a valve cover breather that feeds back into the air clearner, correct me if im wrong. But with a upgraded carb i wouldnt need this i suppose, i would need to replace with another valve cover breather that ive seen on other vettes around the internet. Ive also seen some vettes that had the EGR closed off, is that recommended with an upgrade as well? what would i do with the metal piece that connects down to the header on the driver side?
Edelbrock would not be an upgrade in my book.
You really cant beat the Quadrajet for all around use and performance for what looks like a stockish engine.
If your Quad is not all butchered up and IS a factory piece(not a remanufactured unit)you cant go wrong.
With good parts and some knowledge they are not hard to work on. Just need to do things right.
If that scares you,Lars here on the board is the resident guru(amongst others) and should be by soon for a look see and some sound advise.
Hey, welcome to the forum. We bought a '72 about 8-9 years ago that had an Edelbrock on it. It was okay, but not good/great. My good friend inherited a '71 with an Edelbrock on it. It was absolute junk.
I agree with the advice above. If you have the original Qjet send it to Lars (do a forum search) and pay him to rebuild it. If you don't have the original Qjet or someone has put some other junk carb on it, find an original Qjet and send it to Lars and pay him to rebuild it.
People who say they can't get a Qjet to run really well just don't know them. They are GREAT carbs when they're set up correctly. IMO going to a Ebrock with a manual choke is a huge step backwards. Lars is the guru. He's a Qjet whisperer.
I prefer the Edelbrock Carb and used them on my rebuilds on 3 cars I have, I set the engines up on a dyno and there was minimum difference. We tried a few different combos when setting up the motor. On my rebuilt 71 with a roller cam and rockers , the difference was 3 HP but more torque. its the Thunder Serries and close to 400 HP.
The Edelbrock Carb is much better on any car that sits for a month or more. I put the cars away for the winter and the ones with the Edelbrock Carbs start and run with no issues after sitting.
Also I never had any leaks - 15 years on the 1980 truck, or any run issues, 5 years and 18k miles on the 71 and no issues.
If I remember right the Quad is a spread bore, so you have to take that into account.
Does Lars have a website i can buy good quadrajet? Sending him mine from spain will take awhile, and it would be nice to have the extra to practice taking apart and cleaning myself.
Does Lars have a website i can buy good quadrajet? Sending him mine from spain will take awhile, and it would be nice to have the extra to practice taking apart and cleaning myself.
Cliff Ruggles(cliffshighperformance.com) ships overseas all the time. His parts are some of the best out there. A benefit to that is he wrote the book on Quadrajets( Available on his website)and if you are at all mechanical, a good read of the book and his parts and it should go smooth if you take your time.
Plus he backs his parts with all the technical assistance you need to succeed.
A CSM for your car is a must for all the adjustments after rebuilding.
Take some good pics of all sides including carb# and post so anyone can see if it is a good candidate for a rebuild.
If it is all there and not beat up they are fairly easy to work on.
If it were an older spread bore Edelbrock I'd consider it, I run one on my wife's 66 Pontiac.....they're okay on a 300-350ish hp engine otherwise I think Holley is the best, that's what I got on the ol Vette.
Based on comments, Lars is the guy and can rebuild...and if i need to buy a new carb its Holley > Eddlebrok...Im def interested in buying one new, Quadrajet even. Ill use the old one to break a apart and learn with... does anyone know of a good place to buy a quad that ships overseas?
Based on comments, Lars is the guy and can rebuild...and if i need to buy a new carb its Holley > Eddlebrok...Im def interested in buying one new, Quadrajet even. Ill use the old one to break a apart and learn with... does anyone know of a good place to buy a quad that ships overseas?
@MelWff if i go the quadrajet route, is the old air filter setup my only option? Ive seen other builds with holley/edlebrok and their round filters that look more like race style
@MelWff if i go the quadrajet route, is the old air filter setup my only option? Ive seen other builds with holley/edlebrok and their round filters that look more like race style
Doesn't your stock air cleaner have a duct to feed cold air to the carburetor? That's the way to go.
I prefer the Edelbrock Carb and used them on my rebuilds on 3 cars I have, I set the engines up on a dyno and there was minimum difference. We tried a few different combos when setting up the motor. On my rebuilt 71 with a roller cam and rockers , the difference was 3 HP but more torque. its the Thunder Serries and close to 400 HP.
The Edelbrock Carb is much better on any car that sits for a month or more. I put the cars away for the winter and the ones with the Edelbrock Carbs start and run with no issues after sitting.
Also I never had any leaks - 15 years on the 1980 truck, or any run issues, 5 years and 18k miles on the 71 and no issues.
If I remember right the Quad is a spread bore, so you have to take that into account.
I had the opposite experience with a new edelbrock I had for a few years. I always had to dissemble and clean it one year it had a jelly like substance in the float bowls.
The regular edelbrock carbs are just reproductions of the antique Carter carbs GM used before going to holleys and then later the rochester carbs. edelbrock bought the weber/carter molds from carter along with the manufacturing facility im told (which is kinda cool ill admit as they saved it)
I have a quick fuel /aka holley I bought refurbed from holley on my car now and have no complaints. I need to replace it with a larger carb since im going to a 406 this summer but ive been looking for another QF HR series in the 780cfm model
Engine masters tested a handful of carbs including the summit brand carbs and found the edelbrock design to be the poorest performing on the dyno due to flow restrictions and the hardest to get the proper AFR range through the whole rpm band.
Ready for Carb Upgrade
