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.

1988 Formula Firebird 6.0 LS/Magnum F Swap

Old Sep 30, 2025 | 08:15 PM
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1988 Formula Firebird 6.0 LS/Magnum F Swap

I'm starting a new build thread now that I am back to work on my Firebird. Here is the link to my previous build thread:

Negative One - Third Generation F-Body Message Boards
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Old Sep 30, 2025 | 08:18 PM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap

Short version is I bought a 1991 Base Firebird with the V-6 and 700R4 with plans to LS swap it.

Unfortunately the deeper I dug into it, the more rust I found.
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Old Sep 30, 2025 | 08:20 PM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap

I found a good deal on a 1988 Formula Firebird roller with no interior and less rust. The 88 became the project car and the 91 became a parts/donor car.

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Old Sep 30, 2025 | 08:24 PM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap

The plan is to build an iron block 6.0 with 5364 rec port heads and LS3 intake backed by a T-56 Magnum F to a Strange S60 rear end. I may go with a turbo or Procharger as well.
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Old Sep 30, 2025 | 08:25 PM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap

Right now I am working on replacing the floor pans.

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Old Sep 30, 2025 | 08:26 PM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap


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Old Sep 30, 2025 | 08:27 PM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap

I got a really good deal on a set of floor pans from a local guy that was downsizing his projects.

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Old Sep 30, 2025 | 08:35 PM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap

I've spent the last few days drilling out spot welds. I removed the seat mounts from the donor car as they were cut up in the project car. The project car was being converted into a racecar before I bought it, so the seat braces were cut up for subframe connectors.
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Old Sep 30, 2025 | 09:08 PM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap

right on, keep them posts coming...

your build seems similar to mine
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Old Sep 30, 2025 | 09:20 PM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap

Bold project. Definitely gonna follow this thread
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Old Oct 1, 2025 | 07:57 AM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap

Now would be a perfect time to weld in some DSE sub frame connectors. You should really consider it given how much work you're doing to the floor.
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Old Oct 1, 2025 | 09:07 AM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap

Originally Posted by bk2life
right on, keep them posts coming...

your build seems similar to mine
Will do. I read through your build thread, awesome work. You have serious talent for bodywork and painting.
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Old Oct 1, 2025 | 09:08 AM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap

Originally Posted by QwkTrip
Bold project. Definitely gonna follow this thread
Thank you! I hope my ambitions aren't greater than my abilities.
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Old Oct 1, 2025 | 09:12 AM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap

Originally Posted by ShiftyCapone
Now would be a perfect time to weld in some DSE sub frame connectors. You should really consider it given how much work you're doing to the floor.
I already have inner and outer subframe connectors welded in. I was only going to patch the floors when I originally installed them. Unfortunately, between the number of patches the old floors needed, how thin the metal was in the transmission tunnel was, and the great deal I got on a set of floor pans, I now have to work around the subframe connectors as I replace the floors. Hopefully they will help at least keep the chassis straight as I work, lol.
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Old Oct 1, 2025 | 12:57 PM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap

Originally Posted by rhyno91
I already have inner and outer subframe connectors welded in. I was only going to patch the floors when I originally installed them. Unfortunately, between the number of patches the old floors needed, how thin the metal was in the transmission tunnel was, and the great deal I got on a set of floor pans, I now have to work around the subframe connectors as I replace the floors. Hopefully they will help at least keep the chassis straight as I work, lol.
Good to hear. You may want to tack in some crossbraces before cutting any more. These things are so flimsy.
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Old Oct 1, 2025 | 01:51 PM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap

Originally Posted by ShiftyCapone
Good to hear. You may want to tack in some crossbraces before cutting any more. These things are so flimsy.
Yeah, I plan to do one side at a time to hopefully help alleviate the flex.
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Old Oct 4, 2025 | 09:56 PM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap


I finished the necessary cutting and grinding and was able to test fit the passenger side floor pan today. I had to run to the hardware store for a new hose for the sandblaster, the old one was dry rotted. Next will be a lot of cleaning, welding, and painting.
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Old Oct 9, 2025 | 07:14 PM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap


I sandblasted and primed the seat mounts from the donor car. I've actually gotten quite a bit more done and will post more soon.
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Old Oct 9, 2025 | 07:15 PM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap

I also ordered a T-56 Magnum F from Tick Performance today.
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Old Oct 10, 2025 | 09:04 PM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap

Very cool...
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Old Oct 20, 2025 | 08:20 PM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap

Primed and prepped floor pan waiting for me to have time to install it.
Primed and prepped floor pan waiting for me to have time to install it.
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Old Oct 20, 2025 | 08:21 PM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap

Cleaned up and primed subframe.
Cleaned up and primed subframe.
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Old Oct 20, 2025 | 08:23 PM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap


Picked up my Magnum F today, too bad I have to finish the floor pans before I can do anything with it.
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Old Oct 21, 2025 | 05:15 PM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap

Originally Posted by rhyno91
Will do. I read through your build thread, awesome work. You have serious talent for bodywork and painting.
thanks for the kind words,
much appreciated.
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Old Oct 22, 2025 | 07:47 AM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap

Following! Very similar to my build plans, keep us posted!
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Old Oct 22, 2025 | 06:49 PM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap

Originally Posted by SnkSknrZ28
Following! Very similar to my build plans, keep us posted!
Will do, thanks.
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Old Oct 25, 2025 | 09:52 PM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap

Nice work so far !
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Old Jan 8, 2026 | 06:24 PM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap

I've been really busy lately and haven't had a lot of time to work on projects. My pole barn is neither insulated nor heated, so my work is greatly weather dependent. It's been uncharacteristically warm the last few days, so I did some more welding on the passenger side floor pan. I'm not going to post any pictures of my crappy welds, but I will post this.
Got a good deal with on a low mileage P-1SC-1 procharger.
Got a good deal with on a low mileage P-1SC-1 procharger.
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Old Jan 9, 2026 | 04:31 PM
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Re: 1988 Formula Firebird 6.0 LS/Magnum F Swap

☆☆☆OH SNAP☆☆☆
I see where you are now headed!
😈😈😈😈
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