LTX and LSX Putting LT1s, LS1s, and their variants into Third Gens is becoming more popular. This board is for those who are doing and have done the swaps so they can discuss all of their technical aspects including repairs, swap info, and performance upgrades.

LS1 Carb

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Old Jul 26, 2006 | 05:33 AM
  #1  
dlvalure's Avatar
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From: fort worth texas
Car: camaro rs (a tru sleeper)
Engine: 305
Transmission: turbo 350
LS1 Carb

hello 2 all thirdgen im jus wondering if any one has taken a ls1 block and carbed it....i really dont wanna do the fuel injection i want to bypass da computers vats and all.....and if anyone has done it give me some ideas on how to go about this project
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Old Jul 26, 2006 | 01:34 PM
  #2  
Klortho's Avatar
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From: Kingston, Tn
Car: 1987 GTA
Engine: LT1
Transmission: T56
Axle/Gears: 9 bolt 3.70 posi
You have to get the LS1 carb intake and computer to run all of the timing and spark control. I think Edelbrock makes it.
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Old Jul 26, 2006 | 02:09 PM
  #3  
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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
I've seen a couple of magazine articles on it. Interestingly neither made as much power with the carb as it did with FI.
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Old Jul 26, 2006 | 02:53 PM
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From: Kingston, Tn
Car: 1987 GTA
Engine: LT1
Transmission: T56
Axle/Gears: 9 bolt 3.70 posi
This is true, the tuning capabilities of the carb just can't keep up with FI tuning where you can tune each cylinder individually, plus you lose the fuel milage as well
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Old Jul 26, 2006 | 04:45 PM
  #5  
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From: fort worth texas
Car: camaro rs (a tru sleeper)
Engine: 305
Transmission: turbo 350
so you guys are basically saying that im betta off goin efi fuel injection...because right now im runnin a 1992 camaro rs...305 high performance engine with a 650 holley carb and a th350 no computer and if im going to drop an ls1 with a 6 six speed tranny i hav 2 hook all da computer stuff back up?????
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Old Jul 26, 2006 | 05:14 PM
  #6  
Klortho's Avatar
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From: Kingston, Tn
Car: 1987 GTA
Engine: LT1
Transmission: T56
Axle/Gears: 9 bolt 3.70 posi
Basically, yes.

If you want to have the most out of an LS1, it needs to stay FI with all the little computer gadgets intact.
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Old Jul 29, 2006 | 06:06 PM
  #7  
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From: p'cola FL
Car: 88 iroc-z/28
Engine: 408 lsx
Transmission: 5800 stall
Axle/Gears: 4.71
ls1 carbed here. running great.
runs stronger than any fuel injection ls1 ive been up against.

sure the gas milage isnt there, but im about going fast.
i get 13 in the summer beating on it, 18mpg in the winter if i baby it.
8" race converter and a th350.
cant complain.
good luck.
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Old Jul 29, 2006 | 10:18 PM
  #8  
dlvalure's Avatar
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From: fort worth texas
Car: camaro rs (a tru sleeper)
Engine: 305
Transmission: turbo 350
if u hav ne pics please post because im really trying to build a ls1 carb i dont like computers really trying to stay away frum dat
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Old Jul 29, 2006 | 10:22 PM
  #9  
Klortho's Avatar
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From: Kingston, Tn
Car: 1987 GTA
Engine: LT1
Transmission: T56
Axle/Gears: 9 bolt 3.70 posi
You still have a computer even with the carb setup. It has to have one to run the ignition using all of the sensors on the motor.

Originally Posted by stage20
ls1 carbed here. running great.
runs stronger than any fuel injection ls1 ive been up against.

sure the gas milage isnt there, but im about going fast.
i get 13 in the summer beating on it, 18mpg in the winter if i baby it.
8" race converter and a th350.
cant complain.
good luck.
I know of a guy running an LS1 FI setup, that's running 6.0's in the 1/8th setup with a single turbo on the car, all computer controlled. Quite a few guys around here running low 7's and getting 26+ MPG with a FI setup as well and a couple of them are actually daily drivers.
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Old Jul 30, 2006 | 01:36 AM
  #10  
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From: p'cola FL
Car: 88 iroc-z/28
Engine: 408 lsx
Transmission: 5800 stall
Axle/Gears: 4.71
Originally Posted by Klortho
You still have a computer even with the carb setup. It has to have one to run the ignition using all of the sensors on the motor.



I know of a guy running an LS1 FI setup, that's running 6.0's in the 1/8th setup with a single turbo on the car, all computer controlled. Quite a few guys around here running low 7's and getting 26+ MPG with a FI setup as well and a couple of them are actually daily drivers.
apples and oranges.
both get the job done.
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Old Jul 31, 2006 | 12:22 AM
  #11  
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From: fort worth texas
Car: camaro rs (a tru sleeper)
Engine: 305
Transmission: turbo 350
so do u hav a computer runnin ur ignition system and do ne guys hav ne pics
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Old Jul 31, 2006 | 09:07 AM
  #12  
Klortho's Avatar
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From: Kingston, Tn
Car: 1987 GTA
Engine: LT1
Transmission: T56
Axle/Gears: 9 bolt 3.70 posi
It would look like this



Using this



which uses these to control the timing curves



The drawback to going with this setup vs a FI setup is using the LS1 computer you can tune the spark and fuel for each individual cylinder to get the most HP out of it which yields a better running car, and the best economy you can get. As I stated, I know of a bunch of guys running in the low 7's using a FI setup with just a cam swap and no work done on the heads.

And to be honest, stock for stock, cost vs HP gains it really isn't worth it.

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Old Aug 1, 2006 | 12:17 AM
  #13  
dlvalure's Avatar
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From: fort worth texas
Car: camaro rs (a tru sleeper)
Engine: 305
Transmission: turbo 350
ok i priced out da block, heads, pistons, cam, intake and etc....so what kinda of tranny do i need???
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Old Aug 16, 2007 | 12:03 AM
  #14  
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From: Texas
Car: '91 Firebird
Engine: 305 TBI
Transmission: 700r4
Re: LS1 Carb

You don't need a special tranny. I think you might just need a crank spacer depending on what trans and what year motor. Or you could just get a converter built to fit LS1 to Gen1 type trans. I've got a 2004 6.0 hooked to a TH350(using crank spacer and regular TH350 converter).
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