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.

91 LS3 Swap

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Old Jun 18, 2020 | 11:02 AM
  #1  
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From: Dover, De U.S.
Car: 1991 Z-28/ '94 Impala SS
Engine: 355 TPI/ 350 LT-1
Transmission: T-56 in both
Axle/Gears: 3.73 / 4.56
91 LS3 Swap





Random pics of my recent swap. Car was a L98 with LT 6 speed, HSR, SLP exhaust

Now Lt converted to LS6 speed, LS3 with Tick Stage 2 cam, full Hooker Blackheart exhaust and a ton of other engine and car upgrades


Last edited by Realmac4; Jun 18, 2020 at 11:16 AM.
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Old Jun 18, 2020 | 01:14 PM
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Car: 86 Trans Am
Engine: Carb'd LM7
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Re: 91 LS3 Swap

Digging those CF and Maroon accents. Very well done car.
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Old Jun 18, 2020 | 01:24 PM
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From: Dover, De U.S.
Car: 1991 Z-28/ '94 Impala SS
Engine: 355 TPI/ 350 LT-1
Transmission: T-56 in both
Axle/Gears: 3.73 / 4.56
Re: 91 LS3 Swap

Originally Posted by BigDogBob
Digging those CF and Maroon accents. Very well done car.
Thanks
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Old Jun 18, 2020 | 01:27 PM
  #4  
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Re: 91 LS3 Swap

Did you eliminate the factory coolant overflow because of the ac lines?
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Old Jun 18, 2020 | 01:41 PM
  #5  
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From: Dover, De U.S.
Car: 1991 Z-28/ '94 Impala SS
Engine: 355 TPI/ 350 LT-1
Transmission: T-56 in both
Axle/Gears: 3.73 / 4.56
Re: 91 LS3 Swap


Originally Posted by punkmaster98
Did you eliminate the factory coolant overflow because of the ac lines?
No needed room for the intake/filter

Last edited by Realmac4; Jun 18, 2020 at 01:49 PM.
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Old Jun 18, 2020 | 02:02 PM
  #6  
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From: Dover, De U.S.
Car: 1991 Z-28/ '94 Impala SS
Engine: 355 TPI/ 350 LT-1
Transmission: T-56 in both
Axle/Gears: 3.73 / 4.56
Re: 91 LS3 Swap

Originally Posted by BigDogBob
Digging those CF and Maroon accents. Very well done car.
Tubes are real CF, rest is....Hydro dipped
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Old Jun 18, 2020 | 04:47 PM
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Re: 91 LS3 Swap

What AC bracket did you go with?
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Old Jun 18, 2020 | 07:49 PM
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Re: 91 LS3 Swap

Car looks fantastic. Where did you get your CF tubes?, specifically the one with the MAF mount? Any dyno numbers?
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Old Jun 19, 2020 | 07:56 AM
  #9  
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From: Dover, De U.S.
Car: 1991 Z-28/ '94 Impala SS
Engine: 355 TPI/ 350 LT-1
Transmission: T-56 in both
Axle/Gears: 3.73 / 4.56
Re: 91 LS3 Swap

Originally Posted by toomany
What AC bracket did you go with?
ICT Billet thru Matt Walter (WalterRacecraft)
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Old Jun 19, 2020 | 08:04 AM
  #10  
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From: Dover, De U.S.
Car: 1991 Z-28/ '94 Impala SS
Engine: 355 TPI/ 350 LT-1
Transmission: T-56 in both
Axle/Gears: 3.73 / 4.56
Re: 91 LS3 Swap

Originally Posted by ShiftyCapone
Car looks fantastic. Where did you get your CF tubes?, specifically the one with the MAF mount? Any dyno numbers?


If only it were that easy, lol

IntakeHoses.com for the CF bits, and found a MAF holder I think I used Airraid for that, cut the slot very carefully, taped over the area, drill 2 small holes, then Dremel and cut off wheel to make the slot, then bonded the maf holder to the tube, It's since been rotated out of site, I left it up for tuning purposes


And watch which way the maf goes in, there's an arrow on it for a reason, ask me how I know

And 471w 445t






Last edited by Realmac4; Jun 19, 2020 at 08:53 AM.
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Old Jun 19, 2020 | 08:52 AM
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Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Re: 91 LS3 Swap

Very nicely done. Which power steering reservoir is that? That looks like the Holley one?
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Old Jun 19, 2020 | 09:35 AM
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From: Dover, De U.S.
Car: 1991 Z-28/ '94 Impala SS
Engine: 355 TPI/ 350 LT-1
Transmission: T-56 in both
Axle/Gears: 3.73 / 4.56
Re: 91 LS3 Swap

Originally Posted by ShiftyCapone
Very nicely done. Which power steering reservoir is that? That looks like the Holley one?
Stock 08 Vette LS3, where the motor came from, and thanks



Mike
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Old Jun 20, 2020 | 12:15 AM
  #13  
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Re: 91 LS3 Swap

Looking really good
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Old Jun 20, 2020 | 03:38 PM
  #14  
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Engine: 4.8 LR4
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Re: 91 LS3 Swap

Originally Posted by ShiftyCapone
Very nicely done. Which power steering reservoir is that? That looks like the Holley one?
The Holley one IS a GM reservoir, lol
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Old Jun 20, 2020 | 03:44 PM
  #15  
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Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Re: 91 LS3 Swap

Originally Posted by scooter
The Holley one IS a GM reservoir, lol
Good to know. I have the billet aeroflow one but its outputs are not ideally placed.
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Old Jun 20, 2020 | 04:18 PM
  #16  
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Re: 91 LS3 Swap

Originally Posted by ShiftyCapone
Good to know. I have the billet aeroflow one but its outputs are not ideally placed.
I got the bracket, reservoir and hose cheaper separately than buying the Holley kit complete too
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Old Jun 20, 2020 | 04:25 PM
  #17  
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Transmission: Magnum T56
Re: 91 LS3 Swap

Originally Posted by scooter
I got the bracket, reservoir and hose cheaper separately than buying the Holley kit complete too
Absolutely. I always get GM stuff cheaper browsing the various depths of the interwebs.
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Old Jun 22, 2020 | 07:19 AM
  #18  
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From: Dover, De U.S.
Car: 1991 Z-28/ '94 Impala SS
Engine: 355 TPI/ 350 LT-1
Transmission: T-56 in both
Axle/Gears: 3.73 / 4.56
Re: 91 LS3 Swap

Originally Posted by QwkTrip
Looking really good

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Old Jun 22, 2020 | 07:20 AM
  #19  
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From: Dover, De U.S.
Car: 1991 Z-28/ '94 Impala SS
Engine: 355 TPI/ 350 LT-1
Transmission: T-56 in both
Axle/Gears: 3.73 / 4.56
Re: 91 LS3 Swap

Originally Posted by scooter
The Holley one IS a GM reservoir, lol
Guess that's why they look similar
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Old Jun 22, 2020 | 07:43 PM
  #20  
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Engine: 4.8 LR4
Transmission: T56
Axle/Gears: 3.45 9 Bolt
Re: 91 LS3 Swap

Originally Posted by Realmac4
Guess that's why they look similar
Reservoir, bracket and hose are all GM
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Old Jun 23, 2020 | 07:09 AM
  #21  
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From: Dover, De U.S.
Car: 1991 Z-28/ '94 Impala SS
Engine: 355 TPI/ 350 LT-1
Transmission: T-56 in both
Axle/Gears: 3.73 / 4.56
Re: 91 LS3 Swap

Originally Posted by scooter
Reservoir, bracket and hose are all GM
Yea it's all Vette accessories, made my own P/S lines

Mike
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