Well as you guys know I had my car at Hawks third gen to get the LS1 and M6 swap. My lovely wife decided to wipe my savings clean and take off to her sisters house in Nashville so now I can't get the LS swap finished. I guess she thinks the car is more important than she is, well after that stunt it is. So.... I ran across a 95 Z-28 6-speed car for $500.00 bucks, bought it and hauled it home. Pics are enclosed, this car is nice! New clutch, LS1 SS Spoiler, 35th Anniversary SS leather seats, t-tops, loaded. lol, the motor was knocking, someone ran off the road and put a hole in the oil pan and patched it with JB Weld. Idiots...

Anyway I dropped the motor off at American Auto Machine in Knoxville yesterday and cleaned all the parts, trans, bellhousing, accessory brackets, etc.... I'm having the engine bored 30 over with a custom grind Comp Cam installed. Headers, full exhaust, 4.10 gears, etc... Should make some decent power... Anyway here are the pics...

 

Here's the motor after I pulled everything off, almost ready to pull at this point. Isn't a LS1 but it should still make good power, plus I like the low end grunt LT1's have....

 

BTW, this is my official LT1 M6 build thread for my 1991 WS6 Trans Am....


Intake after I cleaned it, bead blasted it and applied some red Dupli-color engine enamel. I installed new Injector O-Rings and polished the fuel rail... I think it looks killer, thoughts?

 

sorry to hear about the unfortunate turn of events, but good luck on the new project

 

wow i bet that was a dissapointment! but alteast you found a alternative
sounds like your getting thru everything pretty quick which is good. KEEP US UPDATED!

 

I should have known better, she took my 15 grand re-enlistment bonus I got while in Africa back in 08. Spent every penny of it, should have gotten rid of the problem then but I always look the other way and try to be positive. Anyway yeah I want this car done ASAP, it's been too long without an F-body and I really like this car so I'm after it....

 

Here's a couple shots of the car, it's still at Bruces shop but I'm picking it up after I get back from Ft. Dix in three weeks. By then the motor will be built and ready to go...

 

I have read through alot of information on here but have a few questions. On the LT1 with the A/C on the passenger side, has anyone come up with a way to make it all work? If not then what are my options as far as corvette accessories or maybe aftermarket pulley set-ups? I want my A/C!!

Another question, On the fuel lines, since my car is a TPI car factory can I locate some AN fittings and make me a line that will screw into the factory lines then maybe locate a push type adapter to snap onto the LT1 fuel rail? What is the best way to tackle this?

And wiring, the LT1 harness looks almost just like my 91 TPI harness I removed from the car. Now, can I take the LT1 harness and adapt it to my stock harness that comes from the pack connector on the drivers side? The one that has the fan wiring, gauges, ignition, etc.. I'm trying to decide whether to buy a Painless harness or attempt wiring this myself. I think this is my biggest concern.

Thanks for all the help! This board is awesome and has a bunch of knowledge. Thanks again!

 

Thanks, I'm being optimistic! I think this will turn out sweet though the LS1 would have been better this LT1 will still run hard so it'll work fine.

 

For the price of an overhaul and a few mods, the LT1 swap is going to cost just as much as the LSx

LT1 AC:
Read over ghettocruiser's LS1 HVAC box hybrid setup. Thats what you'll be building, only the end lines near the compressor change slightly. You still need the frame notch just like the LSx guys

Fuel lines:
https://www.thirdgen.org/forums/post...131-post9.html

This goes all the way back to the tank. To go to the frame rail up front you need a pair of saginaw fittings commonly sold on ebay 14/16mm x 1.5 O-ring are the threads

Wiring:
TPI/LT1 wiring schematics are worlds apart. The closest to a TPI control system is the 93 LT1, and even it's got quite a few differences. You can however use the TPI harness to control the LT1 by cutting a hole for a distributor and using the outdated TPI ECM. Downside is you still need a very custom chip which isnt easy to come by

Read this
https://www.thirdgen.org/forums/ltx-...rt-finish.html

 

Thanks Pocket, well this swap is definately going to be cheaper. I bought the whole car for $500.00 which has everything I need, well almost, versus $4500.00 just for an LS1 engine and trans.

On the wiring harness, your write up is very helpful and should get me through the LT1 part of it but on my 91, there is a connector under the dash on the passenger side. Does the wires on the LT1 harness that go into the passenger side firewall go to this connector? I need to find the connector number to make it easier to know what I'm talking about, lol. Also I pretty much stripped the wires off of my 91 and all I kept are the drivers side bulkhead connector with the ignition, fans, etc... I'm assuming this has my fuel pump wiring and everything I need to connect to the LT1 harness right?

Just trying to grasp what I'm doing here, first time I've went through a complete harness like this. Sure beats paying a grand for a painless harness. Thanks for the help! I'll be posting pics as I go, heading down here in a few to pull the harness out of the 95 as well as the brake booster, master cylinder and whatever other parts I plan on installing on my Trans Am.

HAPPY 4TH EVERYONE!

 

https://www.thirdgen.org/forums/ltx-...p-3rd-gen.html

Id suggest reselling the TPI harness if it hasnt already been chopped up. A 90-92 V6/TBI harness will work just as well and people throw them away

I practice what I preach, so PM me if you get stuck or just dont want to do it

 

I went by your write up which was very helpful btw, thanks, and modified my TPI harness so it should be ready to go. Now on that LT1 harness, you de-pinned every connector. Would I really have to do that? I'm kinda nervous I'd get the pinouts in the wrong location or something. I'm pulling the harness here in a few and will lay it out and start labeling everything. Thanks for the help, the is a real learning experience.

 

Working on pulling the harness out of the car, just got to find where it connects under the dash on the passenger side.

 

Hey man, I'm in Knoxville, too. If you need any help, I'd love to tag along. I'm always up for thirdgen related tinkering.

BTW: I am looking for a firebird hood to actually produce a Sunoco style hood for the Firebirds. Since you're in Knoxville, this would be excellent - We can probably make some kind of arrangement so you get a free hood out of the deal in exchange for the ability to pull a mold off of your factory one.

 

To get the 3rd gen harness out drop the pass hush panel and remove the ECM. Unplug the C207 (clear connector) and pop the lock clip out near the fender

Now, remove the wheel inner fender liner and pull the harness into the wheelwell. Its a strait shot up past the HVAC box now

I assume you've already got the C100 loose, so the harness is free now

The 4th gen should also be connected behind the hush or side panel

I highly recommend depinning all 4 LT1 PCM connectors. Nearly every wire will require lengthening/trimming and its 10x easier to do that with the wires pulled apart. Label each individual wire by connector name and PCM location to speed the process. Its still going to take a whole weekend or better

 

Ok sweet, I just got done pulling all the crinkle hose off the LT1 harness. So I guess I need to pick up some labels and depin every connector. I guess that makes it easier to see what stays and what goes doesn't it?

I've got one question for you again, thanks for the help btw! I had a pack of wires going into the passenger side. So I took the dash panel off and passenger side kick panel and unplugged those connectors. What connector numbers are those and what is their function? I'm assuming those are going to hook to my clear C207 connector correct? There was a black box attached to a rubber thing behind the kick panel too, is that anything I need to be concerned with? Pics are following, thanks!

 

Sounds good to me man, I'm always up for helping a fellow third genner. I'll holler at you when I get back from Ft. Dix in three weeks, I'll be picking my motor up from the machine shop and dropping it in as soon as I get back. Thanks man!

 

C220/C230

Those house the BCM, gauges and several relay call wires. Most get deleted, but some get reused in different locations. Cut them close and throw the connector body away. New end locations are shifted to the relay center, C100 and C207