i have a 91 camaro 350 and am about to do a ls1 swap i dont want to cut the sd harness to bits so im going to pull on off a junk yard or ebay exactly what years can i use 84-91? carbed harness? tbi? v6?

 

You won't be using the SD harness.

 

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i have to cut or use a harness to connect the ls1 to my harness

 

Use a V6 or TBI from 90-92

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

Some pins changed in the C100 with the older cars

 

So a 87 or 89 harness won't work?

 

When you say "SD harness", you're talking about the ECM harness, I assume. That can be disconnected and pulled out in whole, you won't be using any of that for the swap.

What you will be using is the C100 harness, which connects to the firewall bulkhead harness on the driver side, completely separate from the ECM harness. If you don't want to cut that up, then go get one from a junkyard. The ones Pocket recommended will be relatively plentiful and cheap from the junkyard. Pin-outs for the C100 are linked in the LS1 swap sticky, and in Pocket's thread. https://www.thirdgen.org/forums/ltx-...formation.html

 

my speed density harness i am going to transplant it to my truck and i know i have to cut it up for the swap thats why i am looking what i can use instead because i was going to pull one from the junkyard but theres not to many 91s in there