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.

LT1 Swap

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Old Oct 1, 2002 | 08:27 PM
  #1  
84CamroHO's Avatar
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From: Durham NH
LT1 Swap

Got a question, I got an 84 camaro and I found a fuel tank with pump and sender unit from a 1993 Camaro 6cyl that was fuel injected. Will that work? My car was origianlly carbed so it needs a tpi pump and sender unit. Please let me know if this will work cuz I can get it for real cheap.
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Old Oct 1, 2002 | 09:28 PM
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1991tealRSt-topGuy's Avatar
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Car: 1991 Corvette Coupe
Engine: L98
Transmission: 700R4/4L60 same trans different name
yes the pump should work, the tank however will most likely not fit
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Old Oct 2, 2002 | 04:58 PM
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mat89RS's Avatar
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From: Québec
Engine: LT1
Transmission: 700r4
Yes it will work without any problem. You're main issue will be to have a return fuel line to the tank. Make sure you use a high pressure fuel filter and everything will be fine.

Something else is that LT1 from camaro has driver side fuel lines. 84 camaro with carb as passenger fuel line. check that out ...

make sure you do not pass fuel lines in front of the motor, it's very dangerous. Sliced fuel lines, fuel and high pressure pump is not a mix with exaust manifolds !
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Old Oct 2, 2002 | 05:09 PM
  #4  
wm_sorg's Avatar
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From: Annandale, VA
Car: 1991 Formula Firebird
Engine: 2001 LS1 Modded
Transmission: 2001 4L60E Yank SS3600 TC
Matt can you please send me a picture of you LT1 exhaust setup? This will be extremely helpful for my LS1 swap.

BILL
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Old Oct 3, 2002 | 08:01 AM
  #5  
mat89RS's Avatar
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From: Québec
Engine: LT1
Transmission: 700r4
Well as for the exaust it's fairly easy.

You take headman headers and Y-pipe for 3rd gen F-body... you take a dremel to have them the shape the way your exaust port is and you bolt them to the motor !

that's it !
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Old Oct 3, 2002 | 02:09 PM
  #6  
wm_sorg's Avatar
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From: Annandale, VA
Car: 1991 Formula Firebird
Engine: 2001 LS1 Modded
Transmission: 2001 4L60E Yank SS3600 TC
Thanks Matt. Does this setup include cats?
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Old Oct 3, 2002 | 02:31 PM
  #7  
mat89RS's Avatar
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From: Québec
Engine: LT1
Transmission: 700r4
I'm using the stock catback and 4th gen muffler. The cathalic converter is gutted.
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Old Oct 3, 2002 | 02:56 PM
  #8  
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From: Sulphur Springs, IN
The filler neck on the 4th gen tank is actually too long. I put a 4th gen tank in mine when I did the swap, but I had to shorten the filler neck. I don't remember how much longer it is, but it would have stuck outside the car.
Todd
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Old Oct 4, 2002 | 06:22 PM
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HybridZ28's Avatar
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From: Felton,Delaware
could allways use the LT1 vette fuel rail, it exits on the passenger side.

Also the return line is there on the carb car, the 1/4 inch 3rd line going to the pump is a return.

Originally posted by mat89RS

Something else is that LT1 from camaro has driver side fuel lines. 84 camaro with carb as passenger fuel line. check that out ...
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Old Mar 16, 2009 | 01:07 PM
  #10  
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From: Williamstown, NJ
Car: '98 Mustang GT
Engine: '03 4.6L
Transmission: T45
Axle/Gears: DK
Re: LT1 Swap

Originally Posted by toddlsf
The filler neck on the 4th gen tank is actually too long. I put a 4th gen tank in mine when I did the swap, but I had to shorten the filler neck. I don't remember how much longer it is, but it would have stuck outside the car.
Todd
Really old thread, but I need some info. The filler neck has to be cut? Any pics of this?
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Old Mar 16, 2009 | 02:14 PM
  #11  
third_genbowtie's Avatar
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From: fontana CA
Car: 1991 camaro RS
Engine: 305-LT1 swap
Transmission: 700
Re: LT1 Swap

why do you need a new or diff gas tank. i think you can even change the fuel pump with out dropping the tank.
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Old Mar 16, 2009 | 04:08 PM
  #12  
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From: Williamstown, NJ
Car: '98 Mustang GT
Engine: '03 4.6L
Transmission: T45
Axle/Gears: DK
Re: LT1 Swap

Originally Posted by third_genbowtie
why do you need a new or diff gas tank. i think you can even change the fuel pump with out dropping the tank.

I think I need the sending unit assembly for the 4th gen gauges I put in. I also need a fuel pump for the LT1 swap so I figured on just using all 4th gen fuel components. Having second thoughts if I have to go modifying the LT1 tank.
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Old Mar 16, 2009 | 06:48 PM
  #13  
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From: fontana CA
Car: 1991 camaro RS
Engine: 305-LT1 swap
Transmission: 700
Re: LT1 Swap

Originally Posted by Rich2279
Really old thread, but I need some info. The filler neck has to be cut? Any pics of this?
As for the neck. I read somewhere that all you had to do was cut the 4th gen down some. It has a rubber coupler mid neck that can come apart. Thats where you cut it IIRC
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Old Mar 16, 2009 | 09:26 PM
  #14  
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From: Williamstown, NJ
Car: '98 Mustang GT
Engine: '03 4.6L
Transmission: T45
Axle/Gears: DK
Re: LT1 Swap

Originally Posted by third_genbowtie
As for the neck. I read somewhere that all you had to do was cut the 4th gen down some. It has a rubber coupler mid neck that can come apart. Thats where you cut it IIRC
I'll have to look for a picture. I don't recall seeing them with a rubber coupler.
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Old Mar 18, 2009 | 12:12 AM
  #15  
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Re: LT1 Swap

I recommend getting a LS1 tank and removing the internal fuel pressure regulator in it for a LT1 setup. LS1 pumps are better. I don't think LT1 pumps are any superior to TPI/TBI pumps, could be wrong though.

The LS1 tank has the rubber fuel neck. LT1 has steel, does not have rubber fuel neck. The LT1 steel neck would have to be cut then welded back on, that doesn't sound fun or completely safe.

99-02 LS1 tanks are plastic. 98 LS1 tank is steel and I would assume has the steel fuel neck, LT1 tanks are all steel.

LS1 tanks are not a direct bolt in. The gauge will read different, I still haven't set mine up. Fuel lines have to be modified, etc.

Last edited by Firebat; Mar 18, 2009 at 12:16 AM.
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Old Mar 18, 2009 | 08:35 AM
  #16  
TexasLT1's Avatar
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From: Angleton, TX
Car: '92 RS
Re: LT1 Swap

LS1 tank is the way to go. I switched over to one for this build. Also running a Lonnies Performance dual in-tank pump setup with the correct fuel level sender for the '92. The only issues I had were shortening the filler neck and bending the straps to hold the tank in. Other than that it was fairly straight forward.
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