Suggestions for carb down the road
Thread Starter
Pro
Joined: Mar 2004
Posts: 686
Likes: 0
From: Southeast
Suggestions for carb down the road
I have an Edelbrock 600 CFM carb on my 71 350 right now. The motor has had a lot of work done to it. In the process of putting some Trick Flow heads on it now. I also have a Performer intake on it as well that I may change, but for now it's staying. I'm looking to change out the carb in the future, maybe end of the summer, because of the fact that this carb isn't good for sustained use above 4000 RPM. The bottom end of the motor can handle 6200 RPM. What carb would you recommend? Should I go a step up with an Edelbrock 750 CFM carb? Or should I change to a Holley or BG? I'm looking for reliability and drivability. I don't want to adjust my carb everytime I go out. I do want around 750 CFM though. I think that would be perfect for my set-up. This won't be done right away. Just looking for some ideas.
Race Director
Joined: Jun 2000
Posts: 10,045
Likes: 675
From: FL
Street only - Quadrajet. A Q-Jet is a 750cfm carb with mechanical secondaries. The secondary air door basically makes it a variable cfm carb that will feed what your motor needs.
For street/strip, I would probably go with a 750 cfm Demon with mechanical secondaries.
BTW. Performer manifold tops out at about 5500 rpm. For higher, I recommend a Performer RPM or Weiand Stealth.
For street/strip, I would probably go with a 750 cfm Demon with mechanical secondaries.
BTW. Performer manifold tops out at about 5500 rpm. For higher, I recommend a Performer RPM or Weiand Stealth.
Thread Starter
Pro
Joined: Mar 2004
Posts: 686
Likes: 0
From: Southeast
Originally Posted by SteveG75
BTW. Performer manifold tops out at about 5500 rpm. For higher, I recommend a Performer RPM or Weiand Stealth.
Race Director
Joined: Apr 1999
Posts: 11,520
Likes: 13
From: CORVETTE 77 385 C.I. TEXAS
... I also have a Performer intake on it as well ...
600 is the right size for your setup or 750 Q-J.
Holley 600 would work.
There needs to be about 3/4" CLEARANCE OVER THE FLOAT BOWL VENT TUBES.
Le Mans Master
Joined: Feb 1999
Posts: 6,807
Likes: 0
From: Hoosier
Cruise-In III Veteran
Why do you say the 600 Edelbrock is not good over 4000 rpm? One thing I've done (as recommended by others) is hook up a vacuum gauge to read it inside the cockpit. If you punch it to WOT and the gauge drops to 1+1/2 or less you have enough carb. One trick on Edelbrocks is to file a bit of the secondary vacuum blade counter weight off so it opens sooner and/or further.
Safety Car
Joined: Dec 2004
Posts: 4,876
Likes: 1
From: Jersey Shore Exit 98
Originally Posted by AlwaysWave
Why do you say the 600 Edelbrock is not good over 4000 rpm? One thing I've done (as recommended by others) is hook up a vacuum gauge to read it inside the cockpit. If you punch it to WOT and the gauge drops to 1+1/2 or less you have enough carb. One trick on Edelbrocks is to file a bit of the secondary vacuum blade counter weight off so it opens sooner and/or further.
Burning Brakes
Joined: Apr 2000
Posts: 1,145
Likes: 1
Thread Starter
Pro
Joined: Mar 2004
Posts: 686
Likes: 0
From: Southeast
Originally Posted by 71roadster
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
Drifting
Joined: Nov 2004
Posts: 1,971
Likes: 7
From: Longwood Florida
http://www.aedperformance.com/HO.htm
This carb rocks.... 650 HO... it flowed 680 on my tag..wet tested ready to go!!
I had a 750 Holley vacuum on it...
I Slapped this carb on My NEW LS1... it kicked me in the FACE
This carb rocks.... 650 HO... it flowed 680 on my tag..wet tested ready to go!!
I had a 750 Holley vacuum on it...
I Slapped this carb on My NEW LS1... it kicked me in the FACE
Le Mans Master
Joined: Feb 1999
Posts: 6,807
Likes: 0
From: Hoosier
Cruise-In III Veteran
Originally Posted by Jims79
Interesting do you have pic of the carb after & have you tried shifting in the 4500 rpm range after the fix? I have an edel 600 and it dies or stalls out at 4500...
Le Mans Master
Joined: Feb 1999
Posts: 6,807
Likes: 0
From: Hoosier
Cruise-In III Veteran
Originally Posted by Fubba
I have a mech. sec. carb now...it is an automatic. Which would be better for an automatic? Or does it really matter?