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i want to know if i can put an LT1 in my 86 Trans Am


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8 replies to this topic

#1 Bird-of-Fire

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  • Engine: 5.0L V-8 305 LG4
  • Transmission: 5 speed manual

Posted 15 November 2007 - 04:12 PM

HI! i recently bought an 86 Firebird Trans Am. It has a V-8 305 carbureted engine in it. It had an engine fire and most of the wiring harness in the engine compartment got destroyed. ive decided to put a 350 in it while im doing all this work to get it running. i would also like to switch it to TPI. ive been told that an LT1 would be one of the best engines to put in it, i just need to know if that will work in an 86 and what i will need and roughly how much it should all cost. I need as many details as possible, so anyone who can help me out, id be very grateful. thank you!

#2 FBN Firebird Nation

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Posted 15 November 2007 - 04:57 PM

Welcome to FBN Ethan. You will need the wiring harness, LT1 PCM, 4L60E Transmission. I am not sure if you will need to change the motor mounts or not. I would personally go with a new non-LT1 350, this way you can use your current transmission. You could even dump all the computer stuff and go with a carb. :B):

#3 1tinindian

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Posted 15 November 2007 - 05:34 PM

Welcome to FBN Ethan. You will need the wiring harness, LT1 PCM, 4L60E Transmission. I am not sure if you will need to change the motor mounts or not. I would personally go with a new non-LT1 350, this way you can use your current transmission. You could even dump all the computer stuff and go with a carb. :B):


Exactly like I did!

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#4 blinkn

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Posted 15 November 2007 - 08:02 PM

i looked n2 this mod myself! pritty sure the motor mounts are the same. you will need the motor, wireing harness w/ computer (or painless wireing kit), and probably a different signal sending unit thing (sry but its late and my brains not @ full steam; i cant remember the name :B): ) but it sends a signal from ur trans to ur speedo to let you know how fast ur going. i believe the're mechanical in the '86 and earlier cars (check in the tech archives under T-56 conversion in a third gen- and it will talk about the sending unit thing and weather yours is mechanical or not). It's really not 2 hard of a swap; but i believe the easiest way to do it would be to buy/borrow an LT-1 car, strip it of its motor, trans, CPU, & all the fuel stuff (lines, tank, ect). this could be costly if you had to buy a complete wreck to do this; but you could always sell wats left! in the end you'd have a bad ride!!

BTW, also in the tech files, there is an article that shows you how to custom wire up your fans. i'm not sure if you'd have to do that or not... don't know how hard it would be to make your fans work with the LT1 CPU.

It would be easyer to put back in a carbrated motor... just depends on what you want in the end. Check out Hawksthirdgenparts.com for more info.

#5 Bird-of-Fire

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Posted 15 November 2007 - 08:31 PM

Welcome to FBN Ethan. You will need the wiring harness, LT1 PCM, 4L60E Transmission. I am not sure if you will need to change the motor mounts or not. I would personally go with a new non-LT1 350, this way you can use your current transmission. You could even dump all the computer stuff and go with a carb. :B):



#6 Bird-of-Fire

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  • Transmission: 5 speed manual

Posted 15 November 2007 - 08:33 PM

Thanks for the help guys. as im learning more ive decided to just get a new carb, distributor, wiring harness and a few other things ill need to get my current 305 running so i can start having fun with my new bird. after that i will start finding parts and building my own 350 with new heads and all that good stuff then do a quick swap with the engines and roast some rubber! thank you all for the information!

#7 SoulTerror

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Posted 16 November 2007 - 06:31 AM

I was thinking of getting an LT1 for my bird as well.

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#8 firehawkslplus

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Posted 26 November 2007 - 04:53 AM

[quote name='Bird-of-Fire' post='179608' date='Nov 15 2007, 06:12 PM']HI! i recently bought an 86 Firebird Trans Am. It has a V-8 305 carbureted engine in it. It had an engine fire and most of the wiring harness in the engine compartment got destroyed. ive decided to put a 350 in it while im doing all this work to get it running. i would also like to switch it to TPI. ive been told that an LT1 would be one of the best engines to put in it, i just need to know if that will work in an 86 and what i will need and roughly how much it should all cost. I need as many details as possible, so anyone who can help me out, id be very grateful. thank you!

http://www.thirdgen....heads-gen1.html

The above link is to a thread on 3rdgen board on doing a top end swapie: intake and heads from LT-1 GenII on a GenI. This gets you the best of both worlds. Be warned the heads do require some mods to to work mostly with the coolant flow and intake mods for a conventional distr. :twocents:

Edited by firehawkslplus, 26 November 2007 - 05:03 AM.


#9 Jeff85

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Posted 27 November 2007 - 08:18 PM

Welcome to FBN Ethan. You will need the wiring harness, LT1 PCM, 4L60E Transmission. I am not sure if you will need to change the motor mounts or not. I would personally go with a new non-LT1 350, this way you can use your current transmission. You could even dump all the computer stuff and go with a carb. :lmao22:


you dont have the nessicarily use a 4L60E tranny, i'm planning an LT1 swap myself and im going to use a 700R4.
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