im puttin an 01 LS1 in my 94 camaro Z28 now can the wiring harness from inside the LT1 car be compatible with the LS1 wiring from under the hood basicalliy can LS1 wiring, fuse block and etc. plug into the LT1 wiring, fuse block and etc from in side the vehicle, my brother thinks that this will work but im a little scapitcale i really dont think it would work i do have the whole LS1 wiring from front to back will this work or do i need to rip out the old harness from inside the car and replace it with the LS1 wiring harness tell me what to do and y thanks

 

You will need the PCM and the complete wireing harness fron the LS1.

 

The harnesses are not the same. The LT-1 PCM connections have 4 shorter connectors, wearas the LS1 uses 2 long connections. I think you'll have to go with the whole harness from the LS1.