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post #1 of 23 (permalink) Old 03-13-2010, 06:46 PM Thread Starter
 
 
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new carb

I want to put a new carb on my 65 caprice 283 ... it has the old quadrajet 4barr on it now .I want to go with a holley any suggestions?
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post #2 of 23 (permalink) Old 03-13-2010, 08:36 PM
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Buy a rebuilt Rochester Quadrajet from an experienced carb shop that specializes in performance cars. You have a 283 not a 383 so when you buy the carb tell the nice tech what kind of heads, cam, gear and exhaust you have so they can set the carb to make the most power with the best fuel economy (something the Holley can no do that the Quadrajet can if you keep your foot out of it.). There is no reason to buy a Holley four barel carburetor which will not fit on your current intake maniifold. It is not a better carb than the Rochester carb just differs in how you tune it.Since you are buying a new one instead of rebuilding and tuning up your old carb; I assume you do not know how to tune your's that is why you buy one already set up for your car and not a generic vehicle the way GM did it.

Big Dave
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post #3 of 23 (permalink) Old 03-13-2010, 08:41 PM
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For a 283 with no mods,I would get about a 500 cfm.Pretty good carb and decent fuel mileage.And easy to install.
Do you have any pictures of your Caprice?
I'd like to see a white one again.My parents bought one new in 65-it was white.
I have one myself-it's cobalt blue with black vinyl top.
Rare to find another with one of these!
Mine is in my picturetrail below:

http://www.picturetrail.com/100chevy

Mike.
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post #4 of 23 (permalink) Old 03-13-2010, 10:39 PM
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Edelbrock is the best thing I went with.

Make: Chevrolet
Model: Impala
Year: 1971
Doors: 4
Motor: 400 V8
Tranny: TH350
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post #5 of 23 (permalink) Old 03-14-2010, 11:34 AM
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Holly does make a spread bore replacement. I have one. The Edelbrock carb is good. I have one on another vehicle. Everyone has their own opinions about what carb is better. Spend the extra money and buy a new one, whatever brand you decide.

http://www.impalas.net/forums/image.php?type=sigpic&userid=521&dateline=14693626  69
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post #6 of 23 (permalink) Old 03-14-2010, 08:29 PM
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What I am saying is there is no advantage of one carb over another in terms of power. They all work equally well. The variable venturi Rochester flows the maximum amount of air needed to feed the 283 (up to 750 cfm if the 283 sucks hard enough). The Edelbrock/Carter AVS works the same way but it is a square bore carb like the Holley and will require a new manifold. Holley only sells one fixed cfm spread bore carb now (they used to have three different cfm model number 4175 carbs available in both vacuum and again as a double pumper for a total of six carb choices) which is too large for a 283 for street use at 650 cfm. (Holey model 4175 List number0-9895 http://www.holley.com/0-9895.asp ).

If you buy a Jet Performance rebuilt unit, or one from The Carb Shop in Ontario, California it will be still cheaper than the $495 or so for a new carb. I am not alone in expressing the virtues of the Quadrabog that will put a Chevelle 454 super stock car in the nines with a stone stock carb just using a tune-up. Read this article

http://www.carcraft.com/howto/57178/index.html

The small primaries, the efficiency (due to it's complexity) and the fact that few people are really good at tuning this style of carb all lead to people think the carb is no good, but it is ideal for a SBC or else Chevy wouldn't have put them on top of the engine.

I run Holley's (I freely admit it) but I was bolting Holley's on cars in place of the Carter AFB or AVS (not a Rochester QuadraJet which had not been invented yet); because they were bigger (and back then I was young enough to think that bigger was better in carburetor selection (I have learned better)). A Holley can be tuned with a bucket full of parts that all screw together with a screw driver (or used to), and of course the knowledge of what to do. The AFB's I had used before are just like today’s Edelbrock AVS model which uses rods as well as jets and requires springs and connecting linkage to tune, along with a lot more hard to find knowledge (everyone I know is a Holley "expert"). The Rochester Quadrajet is the most complex of the carbs to tune, but once set up it stays set up, as nothing can unscrew or back off, or get out of wack as everything is vacuum operated.

It is the single most reliable carb and one of the best fuel mixers for street use since the Weber. I will admit it isn't very sexy due to it's being under the hood of every GM car made since it was introduced in 1965, but then if it isn't a Quadrajet it is a Holley.

Big Dave
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post #7 of 23 (permalink) Old 03-15-2010, 08:18 PM Thread Starter
 
 
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I have a white one with 100 spoke daytons i will take pics this friday to busy now ... I like urs what size engine you have in yours?
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post #8 of 23 (permalink) Old 03-15-2010, 10:46 PM
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Hi Patrick.
Mine has a 350engine and 350 trans.And 355 rear gears.I use a quadrajet on it.
It also has the Level air system(I'm missing the vacuum pump)which was Chevy's air shock system for equalizing and keeping the car level.
Also has dual rear antannae's,the left side one is filled over.
BTW,I like and use the quadrajets on most my cars and trucks,but you do need to know how to set them up and tune them.
Looking forward to seeing pics of your Caprice!
Mike.
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post #9 of 23 (permalink) Old 03-15-2010, 10:48 PM
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Also Patrick,if yours was originally white,it should have a thin black stripe running along the body line on the side of the car front to rear.
Mike.
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post #10 of 23 (permalink) Old 03-16-2010, 08:16 PM Thread Starter
 
 
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hey big dave on that carb deal I am going to switch out the maniflod for a edelbrock performer not leave the stock manifold if I go with that does that change things on my carb situation?
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post #11 of 23 (permalink) Old 03-16-2010, 08:30 PM Thread Starter
 
 
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oh yeah mike I still have the powerglide in mine going to change to a 350trans new headers and rebuild motor although it runs strong but carb is jacked up so it hesitates out the gate for just a second its original carb. The 283 is strong though ... will post pics friday got a slow leak in back tire dont want to show her on flat u know.
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post #12 of 23 (permalink) Old 03-17-2010, 12:11 AM
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Quote:
Originally Posted by 65 caprice dude View Post
I have a white one with 100 spoke daytons i will take pics this friday to busy now ... I like urs what size engine you have in yours?
Dude, I gotta see the pics of your car on Daytons too!
After seeing this, I'm curious if I can pull it off on my car or not. (painted Daytons)
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HOW A NOVICE REBUILDS A 66 IMPALA CONVERTIBLE:
http://www.impalas.net/forums/blog.php?u=1432
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post #13 of 23 (permalink) Old 03-17-2010, 07:38 PM
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Once you go to a square bore manifold then the square bore carb is a natural. I was just pointing out there is nothing in herently bad about a Rochester QuadraJet (Rochester 4GC was an awfull carb and the AVS was the better choice). But a QuadraJet won't work on a square bore manifold without an adapter, and an AVS is a good carb.

Big Dave
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post #14 of 23 (permalink) Old 03-17-2010, 08:14 PM Thread Starter
 
 
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cool thanks
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post #15 of 23 (permalink) Old 03-17-2010, 08:20 PM Thread Starter
 
 
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Here is my car man like I said um gonna switch out the manifold , carb and valve covers within about a month .
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Last edited by 65 caprice dude; 04-14-2010 at 08:03 PM. Reason: attach thumbs
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post #16 of 23 (permalink) Old 03-17-2010, 08:25 PM Thread Starter
 
 
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Dude that car has lots of potential keep it up !!! my cousin in georgia has a 66 like that one they can look real nice.
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post #17 of 23 (permalink) Old 03-18-2010, 10:28 AM
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Thanks for the pictures Patrick!
Beautiful Caprice!
Post more if you have them.
Some stuff:
In 65 the Caprice luxury package was an option on the Impala model.
Yours' is without a/c,which surprises me.It must have been a northern car.
It has the torque strap on the right,but I don't see one on the left,where it's most needed.This was GM's repair for the bad motor mounts that would seperate under load.
If you change transmissions,I would suggest a 700-R4 if you can do it.A much better choice than a 350.
Mike.
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post #18 of 23 (permalink) Old 03-18-2010, 05:01 PM
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Mike,
Look again for the torque strap on the drivers side. I see it in th elast picture. Look where it wraps around the upper control arm
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post #19 of 23 (permalink) Old 03-18-2010, 08:27 PM
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I can barely see it now.
Guess my monitor needs glasses!
Thanks,Mike.
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post #20 of 23 (permalink) Old 03-18-2010, 08:28 PM Thread Starter
 
 
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yeah it was made in jansville wisconsin... found it at a auto body shop in Dallas in 2001
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post #21 of 23 (permalink) Old 04-14-2010, 08:07 PM Thread Starter
 
 
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check it out mike

new manifold, holley 600 and new covers
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post #22 of 23 (permalink) Old 04-14-2010, 10:33 PM
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Looks great now Patrick!
How does it run?
A note of caution for you:
Those glass and chrome fuel filters look good,but are known to break and cause engine fires.
And,do you still have your old carb?
If so,I'd be interested in it as a rebuildable core.(I hope it's o.k. to ask on the forum)
Thanks,Mike.
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post #23 of 23 (permalink) Old 04-15-2010, 10:06 PM Thread Starter
 
 
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yeah I still have it in garage. Yes it runs alot better now I just need to change spark plugs I forgot.
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