Carburetor
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Joined: May 2008
Posts: 58
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From: Apex NC
Carburetor
I have a 70, 4-speed, 454 that came with a Holley carb when I bought it 2 years ago. Had trouble with it and wanted to go with the traditional Rochester and bought a rebuilt one. Am having problems with it and want to buy a new carb, but don't know which one to go with; Holley, Edelbrock, etc, much less the correct model number (CFM, etc).
Not going to race it, just driving mostly around town. But do want it to perform the way it was designed to perform.
Would like to get suggestions from experienced vette owners.
Not going to race it, just driving mostly around town. But do want it to perform the way it was designed to perform.
Would like to get suggestions from experienced vette owners.
Safety Car
Joined: Sep 2005
Posts: 4,213
Likes: 643
From: Orange County Ca
What kind of rebuild did you get?
If it was a generic rebuild from AZ or Pep Boys, etc., it may be of questionable quallity.
I've heard good things about the Jet Products rebuilt Q-jets, or buy a book and rebuild it yourself.
Do you have a square bore or spread bore intake?
If it was a generic rebuild from AZ or Pep Boys, etc., it may be of questionable quallity.
I've heard good things about the Jet Products rebuilt Q-jets, or buy a book and rebuild it yourself.
Do you have a square bore or spread bore intake?
Thread Starter
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Joined: May 2008
Posts: 58
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From: Apex NC
Carburetor
I believe it was a 4150 (650 CFM). I got rid of it. It was not the original. The car came disassembled pretty much when I bought it and the guy said he thought that was the carburetor on it when he bought it.
Melting Slicks
Joined: Sep 2005
Posts: 2,694
Likes: 884
From: Warminster PA
I have a 70, 4-speed, 454 that came with a Holley carb when I bought it 2 years ago. Had trouble with it and wanted to go with the traditional Rochester and bought a rebuilt one. Am having problems with it and want to buy a new carb, but don't know which one to go with; Holley, Edelbrock, etc, much less the correct model number (CFM, etc).
Not going to race it, just driving mostly around town. But do want it to perform the way it was designed to perform.
Would like to get suggestions from experienced vette owners.
Not going to race it, just driving mostly around town. But do want it to perform the way it was designed to perform.
Would like to get suggestions from experienced vette owners.
But if you want to change, a vacuum secondary holley, list 3310, with 780 CFM of air flow will run just fine on most big blocks. In order to run this carb you'll need a square bore manifold. I don't know if you'll have enough hood clearance to put a spread bore adapter on if you have a stock manifold.
I wouldn't give up on the quadrajet just yet............
Tom
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Thread Starter
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Joined: May 2008
Posts: 58
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From: Apex NC
Carburetor
Thanks for all the input. I believe I will stay with the rebuilt Rochester for now. I've replaced a couple of parts and for now it runs pretty good. The only problem now is a little gas leak. I have been unable to locate the source of the leak. It only leaks a little gas on the manifold, which my friend said not to worry, it will evaporate.
Racer
Joined: Jan 2006
Posts: 323
Likes: 4
From: McKinney Texas
Thanks for all the input. I believe I will stay with the rebuilt Rochester for now. I've replaced a couple of parts and for now it runs pretty good. The only problem now is a little gas leak. I have been unable to locate the source of the leak. It only leaks a little gas on the manifold, which my friend said not to worry, it will evaporate.
It would be time well spent tracking the leak down. It very possibly is the reason for the engine not running right.
Burning Brakes
Joined: Sep 2009
Posts: 1,124
Likes: 140
From: Western New York
As that liquid gasoline evaporates, it becomes many times more explosive as a gas (gaseous state). Get that leak fixed before you end up with a real "bomb".
Also, if you call Holley and talk with a tech, they will let you know exactly what number carb you should use. Everyone has an opinion, but for the actual answer, make the call. I had 10 different suggestions for my Q-jet replacement and when I called, I ended up with a spreadbore double pumper that uses the original divorced choke setup, throttle cable, and even the original air cleaner. Try that with a universal Holley from Summit or Jegs. By the way, after you call and get the number, call Summit and Jegs to get the best price. They'll order anything that's not in their catalogs for you. Good Luck!
Also, if you call Holley and talk with a tech, they will let you know exactly what number carb you should use. Everyone has an opinion, but for the actual answer, make the call. I had 10 different suggestions for my Q-jet replacement and when I called, I ended up with a spreadbore double pumper that uses the original divorced choke setup, throttle cable, and even the original air cleaner. Try that with a universal Holley from Summit or Jegs. By the way, after you call and get the number, call Summit and Jegs to get the best price. They'll order anything that's not in their catalogs for you. Good Luck!
