Edelbrock 750 carb
Thread Starter
Instructor
Joined: Dec 2001
Posts: 174
Likes: 0
From: Naples Fla
Edelbrock 750 carb
I continue to have problems w/ the carb I put on the new motor. It runs extremely rich now, which it didn't do initially. It about asphyxiates you sitting at a long light. Also, it leaks gas out somewhere, as I can see staining on the intake manifold. I've watched it while it's running, and can't see where it's coming from. Everything is tight, so I assume it's puking out of the top of the carb. Before I made the purchase, I did some research and heard nothing but good things about these carbs. Now that I actually have one, people are telling me horror stories about their experience with them. Is anybody on the Forum having similar problems with this carb, or is it just me? Lars (since you appear to be the carb god), do you have any suggestions? I bought a kit to lean the thing out, but if it's going to continue to have problems, I'll just chuck it and cut my losses and throw my old Holley 750 DP on instead.
Thanks for any input.
Jamey
Thanks for any input.
Jamey
Le Mans Master
Joined: Mar 2002
Posts: 7,456
Likes: 2
From: Coming home from Luckenbach Texas
Re: Edelbrock 750 carb (JameyZ28)
Are you talking about the Edelbrock Q-Jet (stock replacement) or the Edelbrock Performer (square bore)?
If you have the Performer 750, you have waaaaaaay too much carb for your car. I'm guessing this is the case given the symptoms you're describing. You should be using a Performer 600.
If it's the QJet, then yes, there's a problem with the carb. But if there's a defect, Edelbrock is good about standing behind their products.
If you have the Performer 750, you have waaaaaaay too much carb for your car. I'm guessing this is the case given the symptoms you're describing. You should be using a Performer 600.
If it's the QJet, then yes, there's a problem with the carb. But if there's a defect, Edelbrock is good about standing behind their products.
Le Mans Master
Joined: Feb 1999
Posts: 6,807
Likes: 0
From: Hoosier
Cruise-In III Veteran
Re: Edelbrock 750 carb (JameyZ28)
If you're sure everything is tight like the top plate, the bottom gasket, the fuel line connections, then look at
1-fuel pressure. Edelbrock carbs don't like more than 5 1/2 lbs.
2- are the needle seats ok?
3-are the floats set right?
The Edelbrock carb is really the Carter AFB. There's nothing wrong with these carbs by design or performance.
1-fuel pressure. Edelbrock carbs don't like more than 5 1/2 lbs.
2- are the needle seats ok?
3-are the floats set right?
The Edelbrock carb is really the Carter AFB. There's nothing wrong with these carbs by design or performance.
Thread Starter
Instructor
Joined: Dec 2001
Posts: 174
Likes: 0
From: Naples Fla
Re: Edelbrock 750 carb (page62)
It is the Performer 750. I realize it's on the large side, but I thought the 600 would be too small. The 383 does have decent heads (Vortec) w/ a +/-.500 inch lift Crane cam, Performer intake, MSD Pro-billet distributor, 6AL, 10.5:1, headers, and real 2-1/2" duals w/ 2 chamber flowmasters, so I don't think the carb is terribly oversized. I had always intended to lean it out anyway, but it did run reasonably well when it was first installed (8.50 in the 1/8 mile first time out w/ a lousy 60' time). It probably has 3000 miles on it now. It was never run w/o a fuel filter, so there should be no debris in there. I have not had it apart yet. The stories I'm hearing are that there is a common (inherent?) problem w/ the needle sticking open, but I don't know how reliable these sources are. Just wanted to see what other people's experience was.
Thanks again,
Jamey
Thanks again,
Jamey
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Re: Edelbrock 750 carb (AlwaysWave)
Those are wonderful carbs and I used the 750 on my 355 motor for over ten years. Out of the box they are jetted way rich. If your fuel pressure is right you need to sit down and read the book until you understand the relationship of the different fuel cuircuts.
You need to buy the 90 elbo for the fuel inlet. Because the straight out always caused air cleaner base interference with mine. Then you fuel is a straight shot forwards.
You need to buy the 90 elbo for the fuel inlet. Because the straight out always caused air cleaner base interference with mine. Then you fuel is a straight shot forwards.
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
Re: Edelbrock 750 carb (JameyZ28)
If I would have to decide between a Holley Double Pumper and a Edelbrock 750 - this would be a no brainer for me.. Holley all the way!!!! (or BG etc...)
There's a reason why most drag racers use Holley or similar carbs... They just rock!!!
:cheers:
Olivier
There's a reason why most drag racers use Holley or similar carbs... They just rock!!!
:cheers:
Olivier
Burning Brakes
Joined: Mar 2001
Posts: 1,211
Likes: 5
From: Nashville TN
Re: Edelbrock 750 carb (JameyZ28)
I have one of these and it took a little while for me to iron out the kinks with it. Make sure that your floats are set properly and that the needle and seats are clean. These carbs are easily harmed by dirt. The only real way for them to leak is if the float level it set to high, there really is nothing below the main body/top seam to leak.
Try different combinations of metering rod springs and pay attention to vacuum leaks. Those springs play a great role in how the car is going to run. You shouldn't need more than 2 turns of the mixture screws to achieve a good idle.
I was frustrated when I started to work with the carb, thought it was a POS. I have come to like it and respect how well it runs. Be paitent and work with it.
Try different combinations of metering rod springs and pay attention to vacuum leaks. Those springs play a great role in how the car is going to run. You shouldn't need more than 2 turns of the mixture screws to achieve a good idle.
I was frustrated when I started to work with the carb, thought it was a POS. I have come to like it and respect how well it runs. Be paitent and work with it.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Burning Brakes
Joined: Feb 1999
Posts: 951
Likes: 0
Re: Edelbrock 750 carb (JameyZ28)
Edelbrock makes a square bore Performer and a spread bore Performer. The spread bore model is a Q-Jet replacement. I have a 750 cfm spread bore model #1902. In MHO it is the best "street" carb for performance. It is very responsive. Mash the throttle from a standstill, no bogs or hesitation.
Burning Brakes
Joined: Oct 2001
Posts: 1,146
Likes: 0
From: Milford NH
Re: Edelbrock 750 carb (JameyZ28)
Have you called Edelbrock yet? I have had excellent luck with them, they are very helpful. I have never hear of anyone ever having problems with an Edelbrock carb.
Advanced
Joined: May 2002
Posts: 84
Likes: 0
From: Gulf Coast MS
Re: Edelbrock 750 carb (JameyZ28)
I run a Carter 750 on my small block, and have had no problems. I did rejet it to run with a small supercharger. It's been a great carb. You may have to play with the jets and things. The mail order companys have a kit with everything you need to tune it. :chevy :seeya
