Carburetors Carb discussion and questions. Upgrading your Third Gen's carburetor, swapping TBI to carburetor, or TPI to carburetor? Need LG4 or H.O. info? Post it here.

Linkage geometry?

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Old Nov 21, 2005 | 02:07 AM
  #1  
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From: Middle Tennessee
Car: 84 trans am
Engine: 305 H.O. with small cam
Transmission: th350 with manual valvebody
Axle/Gears: 3:73's
Linkage geometry?

Im am planning on buying a new edelbrock carb, and i was wondering if the factory carb linkage can be used or if i have to make or purchase one. I read that the TV cable has to have the exact same geometry in relation to the factory or i might screw the tranny up, and for me that would be a much to costly mistake. Which brings me to my next question. Is the carb really worth replacing or are these carbs just as good. Mind you all the emissions junk and computer controled parts on my carb arent functional anymore.The car is an 84 TA with the 305 HO. Thanks alot.
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Old Nov 21, 2005 | 11:00 AM
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
If the computer control isn't functional anymore, and you don't want to make it functional again, then you need to replace the carb and distributor. You'll also need to control the torque converter clutch.

Whether the factory linkage will be acceptable depends on your choice of carb and intake.
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Old Nov 21, 2005 | 11:24 AM
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From: Middle Tennessee
Car: 84 trans am
Engine: 305 H.O. with small cam
Transmission: th350 with manual valvebody
Axle/Gears: 3:73's
the torque converter lock up still works, its still connected to the ecm and is functional, its just all that junk on the carb that isnt and the smog pump .Basically everything electronically controlled to the engine has been elimanated for ease of operation i guess. And as far as the distributor is concerned, i dont see why that maters, cuz the advance is functional, and the vacum advance still works, the only other thing that might be of concern is the knock sensor since this is an l69 car.I think somebody might have already replaced the distributor. The car runs great, it just seems that it might could benefit from the old carb as it looks to have been rebuilt, but looks like a bad job.What kind of distributor and carb wold you recommend?
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Old Nov 21, 2005 | 11:31 AM
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
There's no vacuum or mechanical advance on the CCC distributor, the advance is controlled by the ECM. When the ECM loses the TPS and MCS signals from the carb, it will have a hissy fit and stop controlling the advance and TCC.
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Old Nov 21, 2005 | 03:10 PM
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From: Lexington, SC
Car: 1987 SC/1985 TA
Engine: 350/vortec/fitech
Transmission: T56
Axle/Gears: 3.27 9-bolt
If your torque converter is still locking it's an indication that the ecm is still receiving signals from the carb. If this is the case you may be better off fixing what you've got.

If your dist has vaccuum advance it has been swapped out.

You probably won't notice a performance difference between the edelbrock and a properly tuned and adjusted ccc-qjet. You probably will notice the drop in mileage.
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Old Nov 21, 2005 | 03:18 PM
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From: Middle Tennessee
Car: 84 trans am
Engine: 305 H.O. with small cam
Transmission: th350 with manual valvebody
Axle/Gears: 3:73's
ok, thanks a lot guys, now i just need to figure out if my performer rpm intake i got will fit under the hood with the carb, cuz i heard the l69 305's do better with the rpm version than just the performer, but i dont have the money to buy a cowl hood. Maybe it will.
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Old Nov 21, 2005 | 03:41 PM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
The Edelbrock carb would be a downgrade from the stock part.

The RPM will fit under the hood with the stock carb if it is not the Air Gap style, and if it is the spreadbore style.
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Old Nov 21, 2005 | 06:54 PM
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From: Middle Tennessee
Car: 84 trans am
Engine: 305 H.O. with small cam
Transmission: th350 with manual valvebody
Axle/Gears: 3:73's
it is the spreadbore. Why would the edelbrock be a downgrade b/c none of the electronic features work on the quadrajet anymore.And it cant work with the distributor anymore b/c it dosent have the electronic advance. I hate to keep askin questions and all but my brother keeps on insisting i get ride of the quadrajunk and get an edelbrock 600 to go on it, and he knows his way around a car pretty good.I just dont wanna toss it if it will be a good carb as it is.
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Old Nov 21, 2005 | 06:58 PM
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Rebuild it or repair it and it will easily outperform the edelbrock in every respect.
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Old Nov 21, 2005 | 08:05 PM
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From: Middle Tennessee
Car: 84 trans am
Engine: 305 H.O. with small cam
Transmission: th350 with manual valvebody
Axle/Gears: 3:73's
alright, thanks.
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Old Nov 22, 2005 | 11:09 AM
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From: Lexington, SC
Car: 1987 SC/1985 TA
Engine: 350/vortec/fitech
Transmission: T56
Axle/Gears: 3.27 9-bolt
Your q-jet must be working some for your converter to lock and if you've got a vaccuum dist you're even better off.

Save the money you'd spend on a new carb for something that will make the car go faster.
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Old Nov 22, 2005 | 01:21 PM
  #12  
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From: Middle Tennessee
Car: 84 trans am
Engine: 305 H.O. with small cam
Transmission: th350 with manual valvebody
Axle/Gears: 3:73's
yeah, im thinkin of boltin up a dynomax cat back, cuz for 180 bucks, that aint to bad for a full cat back exhaust.
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Old Nov 22, 2005 | 06:06 PM
  #13  
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Originally posted by five7kid
The Edelbrock carb would be a downgrade from the stock part.
The Edelbrock "600" is actually a good marine carburetor - Just like it's original version, the Carter AFB. Tie a small rope or light chain to it, throw it overboard, and it will keep almost any small skiff, jon boat, or canoe from drifting. If you don't feel like pulling it back up, simply untie the rope or chain. Seems like a waste of a good rope, though.

I'll never understand why so many people ditch a superior Rochester carb for something like a street-designated Holley of Edelbrock. And the Rochester will outflow almost all of them, yet still provide better economy through the primaries. Am I missing something?
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Old Nov 22, 2005 | 06:15 PM
  #14  
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Originally posted by Vader
Am I missing something?
Apparently you don't read enough magazines...
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Old Nov 22, 2005 | 08:16 PM
  #15  
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Originally posted by five7kid
Apparently you don't read enough magazines...
Literally laughed out loud at that one. The dog looked at me as if I were crazy. (Does he know something I don't?)

I don't have enough time to look at all the advertisement journals, err, magazines. I've picked one or two good ones that actually have technical information. That, and time slips.

Bandit,

These people are mostly right. Save the money you would have spent on the replacement carb, repair your original carb, maybe get a reman HEI electronic distributor, and still be money ahead. You might be able to get a decent cam and lifter kit for that much, and really have something to put the QuadraJet to work. There is a whole board of member here that can walk you through the repair and performance tuning of the QuardaJet, and once you do, you'll wonder why you ever thought about changing it.
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Old Nov 23, 2005 | 01:47 AM
  #16  
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Oh come on now, the AFB was state-of-the-art in 1956, so it has to be good, right?
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