GTA91

iTrader: (14)

Just wondering how many of us are on here and who has good info on doing the wiring yourself and LT headers. The only LT header option I see is modifying hooker SC LTs. Wiring just scares me... not sure if I want to tackle it or not. Some people say its not that hard, others say its hard. What gives? I'm close to putting mine all together in the car, just need headers, clutch, and wiring.... I'm getting tired of looking at this in my garage...


up on stands

LS1 and T56 ready to go in

no motor


Thanks for any help!

-Jeremy

crainholio

iTrader: (2)

Wiring is easy but time consuming.

MrDude_1 collected a good bit of info on wiring that may or may not be useable for your car. I think his is a '91.

There's so much variation in connector pinouts from year to year on thirdgens that I don't even bother posting mine...my '82 C100 and C207 pinouts undewent at least 8 changes just to get an '88 TPI harness to connect and function back when I did that swap. If someone's swapping an '01 LS1 into an '82 Camaro they're in luck, otherwise it's worthless.

CamaroCain

iTrader: (1)

I saw your post in my thread about some wiring questions, i will send you a pm about the wiring. As far as headers go i am not sure of any on the market yet, but then again i havent been looking for any. Hopefully someone will come out with a decent set in the near future, because if i get too caught up in my thirdgen i may have to get a custom set made.

GTA91

iTrader: (14)

Clint-Thanks for the PM... I might just try and tackle the wiring myself.... I just have soooooo many questions.

89FormulaLS2

iTrader: (1)

That's why I just had speartech modigy the LS1 harness for my car. Sure, it's some serious cash outlay - but it saves sooooo much time and hassle, that to me it was well worth it. From what I understand, every year 3rd gen had somewhat different wiring, and even the camaros and firebirds differed quite a bit in some of the same production years. If you're a wiring guru, I say have at it and give it a go. If you're not (like me), then what I paid Speartech is money well spent and lets me sleep well at night knowing it's all correct.

GTA91

iTrader: (14)

How much? Did you ship your 3rd gen and 4th gen harness to them or what?

crainholio

iTrader: (2)

You might want to get familiar w/ the search button, lots of relevant info you'll want to digest. It's only been a whole day or so since this exact subject was discussed with another '91 owner...

https://ls1tech.com/forums/conversions-swaps/297938-plug-play-harness.html

MrDude_1

iTrader: (4)

on a related note....

have you noticed how much the search feature SUCKS on this website?

i donno what the deal is... perhaps its rating threads, or it doesnt update the search database often, or whatever.... in anycase, i can make a post, then the next day, search on words or even phrases i KNOW i posted, and search under my name, and it doesnt come up.

the search feature is either buggy, or it uses some thread rating system or somthing... because its really hit and miss.

GTA91

iTrader: (14)

Yeah, I agree with Mr. Dude.... I always try searches... never much luck though.


*Thanks for the link to that other post though!

89FormulaLS2

iTrader: (1)

I sent them the LS1 harness to be reworked. I kept the 3rd gen harness because I'll need it to put the TPI engine into another car.

John charged me $750 for reworking the harness, and there are about 8 wires or so that will need to be tied in to the dash in order for the stock gauges to work. (Speedo and Tach need signal converter adapters, as well).

I went the $750 rework option because I needed to keep all the emissions equipment intact. Otherwise I could have gone the $450 option and had them make a custom harness from scratch, and just sold the stock LS1 harness.

I also paid him $50 to reflash my PCM from an A4 to an M6.

crainholio

iTrader: (2)

While it may not be incredibly intuitive, I just did a search on 'wiring harness' selecting the Conversion & Hybrids forum and found plenty of relevant discussions.

You want to use the Advanced Search feature, not the little popup box. This lets you pick specific forums and narrow the date range.

kickassT/A

iTrader: (3)

don't flp headers fit without a problem? one of my friends has a turd gen with an ls1 in it, and that whats on his car.

GTA91

iTrader: (14)

Any chance you could get me his contact info? I'd like to talk with him about his headers.

Thanks!

TJ

iTrader: (10)

yea. thats good info right there.

GTA91

iTrader: (14)

What?

TJ

iTrader: (10)

that would be good info if the headers actually fit.
sorry for my lack of grammar.

busta9876

iTrader: (3)

i made a set of headers for my 67 pickup i have a 6.0L in. I started out with mustang GT shortie headers, and cut the clanges off, reamed the tubes round again and then flattened them to match the oval of the 6.0l/ls1 ports then welded to my flanges..everything done i had $130 and about 5 hours in my headers.

the mustang shorties sweep back without droping much from the exhaust ports, not sure but they might fit in a 3rd gen.

as for the harness, i just got done putting a LT1 in a 88 Firebird (originally 305 thorttole bodie) was able to get all guages working and speedo with stock lt1 harness...only used a few wires from the factory harness.

I found the power wires in the harness, removing the fueses, and using a ohm meter to find which wires went to which fueses, the LT1 computer coil, injectors uses the fueses on the fues panel as they are labled...nice install.

gm is nice that colors are for the most part very common among gm vehicles.

pinks are key hot, oranges are hot at all times, green is usually temp signal, etc etc...
good luck, im in souther missouri, your in St louis..pm me with any qustions ive done a few swaps

GTA91

iTrader: (14)

Thanks for the info man!

*As for those 4th gen FLP headers up above.... they will NOT work.

TJ

iTrader: (10)

ouch. sounds like you have tried them and wound up with an empty wallet.

GTA91

iTrader: (14)

No empty wallet, just some experienced guys I've talked to. I did try a set of used MAC mids and they wouldn't not work. The first header primary on 4th gen headers just comes downward way too soon... it hits the k-member so badly that you can't even bolt them on.


*Believe me, I test fitted them on my engine stand with a stock k-member bolted to the engine.... it just won't work. This is why I just ordered my Stainless Works LS1 full length headers from www.hawksthirdgenparts.com today