Carb info
Race Director
Joined: Apr 1999
Posts: 11,520
Likes: 13
From: CORVETTE 77 385 C.I. TEXAS
So far it sounds like you only need 600-650.
See CARBS Tests TQ/HP
http://www.corvettefaq.com/c3/carbcomparo.htm
See CARBS Tests TQ/HP
http://www.corvettefaq.com/c3/carbcomparo.htm
Thread Starter
Heel & Toe
Joined: Aug 2009
Posts: 19
Likes: 0
REBUILT HOLLEY 0-84021 SPREADBORE 650CFM CARBURETOR
Please waitImage not availableEnlarge
Item condition: Remanufactured
Time left: 6 days 23 hours (Oct 18, 200907:35:29 PDT)
Bid history: 0 bids[Refresh]
Starting bid: US $99.95
Enter maximum bid: US $
Place bidPlace bid
(Enter US $99.95 or more)
--------------------------------------------------------------------------------
or
--------------------------------------------------------------------------------
Price: US $119.95 Buy It NowBuy It NowBuy It Now
You can also: Watch this item
Now watching in My eBay Now watching in My eBay
Is this what I need?
Please waitImage not availableEnlarge
Item condition: Remanufactured
Time left: 6 days 23 hours (Oct 18, 200907:35:29 PDT)
Bid history: 0 bids[Refresh]
Starting bid: US $99.95
Enter maximum bid: US $
Place bidPlace bid
(Enter US $99.95 or more)
--------------------------------------------------------------------------------
or
--------------------------------------------------------------------------------
Price: US $119.95 Buy It NowBuy It NowBuy It Now
You can also: Watch this item
Now watching in My eBay Now watching in My eBay
Is this what I need?
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Your Q-jet has 750 cfm (capability) by its design..."bigger" than the other Holley's you are considering. Plus, it is more economical when you aren't stomping the pedal; and, since you already have it, it's FREE! It is a more sophisticated carb than a Holley and nothing sounds quite like a Q-Jet when you go WOT. Why do you want to swap it out? It's a better carb. For most 350 engines, Holley's have more 'reputation' and 'image' than actually being any better.
Race Director
Joined: Oct 2000
Posts: 15,044
Likes: 79
From: central FL, near the beach.
i'm now a holley guy, but i wouldn't replace a Q that works well.
Buy new heads!
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
Racer
Joined: Nov 2007
Posts: 318
Likes: 3
From: kuwait
Your Q-jet has 750 cfm (capability) by its design..."bigger" than the other Holley's you are considering. Plus, it is more economical when you aren't stomping the pedal; and, since you already have it, it's FREE! It is a more sophisticated carb than a Holley and nothing sounds quite like a Q-Jet when you go WOT. Why do you want to swap it out? It's a better carb. For most 350 engines, Holley's have more 'reputation' and 'image' than actually being any better.
Burning Brakes
Joined: May 2006
Posts: 774
Likes: 1
From: Round Rock Texas
They did a rebuild feature on Musclecar and found you could get great performance from the Q Jet, but it took a total rebuild and some jet/pump changes. It really made a great deal of power and you could make it breathe to 800 cfm. It looked like a complicated rebuild.
There is a reason most motors are sporting Holleys/Edelbrocks/Demons. They make great power and are easily rebuilt or enhanced. You haven't mentioned if the cam/heads are stock? 750 cfm is probably about right for your motor.
There is a reason most motors are sporting Holleys/Edelbrocks/Demons. They make great power and are easily rebuilt or enhanced. You haven't mentioned if the cam/heads are stock? 750 cfm is probably about right for your motor.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
There is nothing really complicated about getting a Q-Jet to function well. Getting it to function as well as is possible (for the design of the carb) is more difficult and requires specific knowledge that most of us {including me} do not have. But, the same thing goes for a Holley or any other carb; if you know the "tricks" you can make it work better. A Q-Jet that is rebuilt with a quality kit and adjusted properly will work better [in all categories] than a Holley of comparable size that is purchased "off the shelf". Rebuild your existing carb and take the time to do so carefully, with the intent on learning about how it works and setting it up as best you can. Buy a book or two from the experts and read them to guide your work. The books and rebuild kit will cost a lot less than a new Holley, and you can take pride in the work you did, the knowledge you gained, and the performance improvements that YOU achieved.
Burning Brakes
Joined: May 2006
Posts: 774
Likes: 1
From: Round Rock Texas
That episode rebuilding the Q Jet was on again this past Sunday. Find the episode and watch them rebuild it. Good viewing. It can make a lot of power. Too complicated for me, but that's just me. I eventually installed a 750 Speed demon, but still had to play with jet size.
