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 firebird build

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Old Sep 30, 2015 | 05:42 PM
  #1  
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From: Birmingham Alabama
Car: 1991 Firebird convertible
Engine: LQ4 ls 6.0
Transmission: 4L60E
Axle/Gears: 342 Limited slip
91 firebird build



Here is a shot of the engine in the car

Last edited by Mirror Image; Sep 30, 2015 at 07:12 PM.
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Old Sep 30, 2015 | 05:58 PM
  #2  
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From: Birmingham Alabama
Car: 1991 Firebird convertible
Engine: LQ4 ls 6.0
Transmission: 4L60E
Axle/Gears: 342 Limited slip
Re: 91 firebird build

Here are my C5 corvette brakes



Last edited by Mirror Image; Sep 30, 2015 at 06:08 PM.
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Old Sep 30, 2015 | 06:15 PM
  #3  
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From: Birmingham Alabama
Car: 1991 Firebird convertible
Engine: LQ4 ls 6.0
Transmission: 4L60E
Axle/Gears: 342 Limited slip
Re: 91 firebird build

Soon to be coilovers for the rear,also
I blasted and sprayed it with truck ben liner






I have install Founders control arm and lower panhard bar and I boxed the upper panhard bar KWB AGX shocks

Last edited by Mirror Image; Oct 4, 2015 at 03:22 PM.
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Old Mar 3, 2016 | 11:33 PM
  #4  
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Car: 1991 Firebird
Engine: 3.1L V6
Re: 91 firebird build

Any updates? Loving it.
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Old Mar 5, 2016 | 10:15 AM
  #5  
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From: Birmingham Alabama
Car: 1991 Firebird convertible
Engine: LQ4 ls 6.0
Transmission: 4L60E
Axle/Gears: 342 Limited slip
Re: 91 firebird build

Wating on my brake parts to be powder coated so i can get the subfram connectors installed then ehxaust done
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Old Mar 5, 2016 | 11:26 PM
  #6  
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From: Birmingham Alabama
Car: 1991 Firebird convertible
Engine: LQ4 ls 6.0
Transmission: 4L60E
Axle/Gears: 342 Limited slip
Re: 91 firebird build


Here are some other photos the gas tank was striped and painted base clear

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Old Mar 13, 2016 | 12:45 PM
  #7  
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Car: 91 Trans Am
Re: 91 firebird build

Good lord that thing is pretty
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Old Mar 13, 2016 | 12:48 PM
  #8  
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From: Birmingham Alabama
Car: 1991 Firebird convertible
Engine: LQ4 ls 6.0
Transmission: 4L60E
Axle/Gears: 342 Limited slip
Re: 91 firebird build

Thanks still wating on the power coat on the C5 brake brackets and hubs
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Old Mar 13, 2016 | 01:14 PM
  #9  
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Car: 87 TA clone
Engine: 70/70 Turbo 5.3 LS
Transmission: bullet proof 2004R
Axle/Gears: ford 8.8, 3.55 gears
Re: 91 firebird build

Looks good! Very purdy.

Just 2 things tho...

1.) can't see in the pics but I hope you didn't fill the whole PHB support all the way down by where the 2 meet. As the PHB will literally push itself into the empty cavity in the upper bar.

2.) coil overs on the front you won't get the drop your probably thinking but ur going to prob want to support the strut tower with a STB at least. Coil overs on the rear ur going to need to weld the upper support plates to the inside frame bucket so be ready to strip the truck bed coating off and weld and paint again. Also u might want to fab up a lowering mounting the rear end side for the PHB mount. As soon as u lower it it's going to screw up the PHB angle and ur going to want to correct it.
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Old Mar 13, 2016 | 02:45 PM
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From: Birmingham Alabama
Car: 1991 Firebird convertible
Engine: LQ4 ls 6.0
Transmission: 4L60E
Axle/Gears: 342 Limited slip
Re: 91 firebird build

Yeah i did mock up the upper pan hard bar without the springs and shocks it is close and i getting a kit that come with the plates and all just wish i had gone this way from the start
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Old Mar 14, 2016 | 11:09 PM
  #11  
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From: Birmingham Alabama
Car: 1991 Firebird convertible
Engine: LQ4 ls 6.0
Transmission: 4L60E
Axle/Gears: 342 Limited slip
Re: 91 firebird build




If you haven't got the C5 corvette brake setup from bigbrakeupgrade@gmail.com you should fits great now its on to the other side
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Old Mar 29, 2016 | 10:41 PM
  #12  
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Car: 1991 Firebird convertible
Engine: LQ4 ls 6.0
Transmission: 4L60E
Axle/Gears: 342 Limited slip
Re: 91 firebird build

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Old Mar 29, 2016 | 10:44 PM
  #13  
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From: Birmingham Alabama
Car: 1991 Firebird convertible
Engine: LQ4 ls 6.0
Transmission: 4L60E
Axle/Gears: 342 Limited slip
Re: 91 firebird build

And thanks for all the compliments
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Old Mar 30, 2016 | 11:41 PM
  #14  
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Re: 91 firebird build

Man, you're going all out with the paint. It will certainly look amazing when you're done.
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Old Mar 30, 2016 | 11:44 PM
  #15  
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From: Birmingham Alabama
Car: 1991 Firebird convertible
Engine: LQ4 ls 6.0
Transmission: 4L60E
Axle/Gears: 342 Limited slip
Re: 91 firebird build

Originally Posted by QwkTrip
Man, you're going all out with the paint. It will certainly look amazing when you're done.
Man thanks its been a lot of hard work but it will pay off at the end
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Old Jan 31, 2017 | 09:08 PM
  #16  
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From: Vermont
Car: 91Firebird Formula
Engine: 5.0 TBI / Now LS1
Transmission: Auto / Now T56 with stage 2 monster
Axle/Gears: 4/10
Re: 91 firebird build

following.
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Old Oct 28, 2017 | 07:38 PM
  #17  
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From: Birmingham Alabama
Car: 1991 Firebird convertible
Engine: LQ4 ls 6.0
Transmission: 4L60E
Axle/Gears: 342 Limited slip
Re: 91 firebird build

Got the bottom finished should be running by thanksgiving


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Old Oct 28, 2017 | 09:32 PM
  #18  
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From: so cal
Car: 89 tta
Engine: turbo v6
Transmission: 200r4
Re: 91 firebird build

man thats a lot of red, looks good sir!
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Old Oct 29, 2017 | 07:38 AM
  #19  
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Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: 91 firebird build

To nice for me!!!! looks great tho!!!
Only thing I could see that may need a change is the single fan. Swap it to factory dual fans.

Last edited by TTOP350; Oct 30, 2017 at 06:40 AM.
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Old Oct 29, 2017 | 06:00 PM
  #20  
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From: Birmingham Alabama
Car: 1991 Firebird convertible
Engine: LQ4 ls 6.0
Transmission: 4L60E
Axle/Gears: 342 Limited slip
Re: 91 firebird build

Originally Posted by TTOP350
To nice for me!!!! looks good tho
Only thing I could see that may need a change is the single fan. Swap it to factory dual fans.
I am looking into that and a double bypass radiator thanks i can't wait to drive it again
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Old Oct 29, 2017 | 06:19 PM
  #21  
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Car: 87 TA clone
Engine: 70/70 Turbo 5.3 LS
Transmission: bullet proof 2004R
Axle/Gears: ford 8.8, 3.55 gears
Re: 91 firebird build

Originally Posted by Mirror Image
I am looking into that and a double bypass radiator thanks i can't wait to drive it again
double bypass is a bad idea. Requires something like 8x the pressure and 4x the flow. Basically cuts the rad in half and requires massive flow. It’s great in circle track by they are always spinning 6k+ and have tons of pump flow and airflow.

stick to a single crossflow design, dual 1” cores and a good dual fan puller with a shroud that covers 90% of the core and ur golden. High pressure flaps are prob a good idea but not necessary. I’ve run them and haven’t and don’t see much high speed cooking differences. I’m a big fan of OE style fans as they are usually much better besides Spal and the new derale stuff. Plus the OE stuff is much cheaper and usually have a integrated plastic shroud. I use Chevy traverse fans on my 27.5” core Afco rad and they cost me like $100 new. Putting a double bypass will hurt flow and cooling.
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Old Oct 29, 2017 | 06:23 PM
  #22  
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Car: 1987 GTA 350 auto
Re: 91 firebird build

great build
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Old Oct 29, 2017 | 09:51 PM
  #23  
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From: Birmingham Alabama
Car: 1991 Firebird convertible
Engine: LQ4 ls 6.0
Transmission: 4L60E
Axle/Gears: 342 Limited slip
Re: 91 firebird build

I seen people using the double pass didn't know much about them I'll stay with what I have if it runs normal temperature I'm also a fan of oem I like being able to get parts from many parts stores
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