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Hi. Made changes to the lt1 motor, where can I find software to edit the lt1 pcm(free if possible)? Also need the cable to go from my Laptop to obd2... appreciate all the help.
What year is your car? If it is a '96 and OBD2, I am not sure.
However, if it is '95 or earlier, try looking at Moates.net for the cable/equipment to connect.
They also had a free program called TunerProRT that could modify the program. I got it several years ago, but I am not sure if it is still free. There are also some free programs to flash the computer ('94-'95), something like winflash (although that may not be free any more). You can also download tunercats with a 30 day full functioning program for about $20.
As stated above, if it's pre-96 you can probably still get TunerPro free; or you can buy Tunercat for ~$100 or so after everything is purchased (cable, program, definition file). If it's a 96, I think your only option now is Jet DST, which is priced at $400ish (shop around). The Jet software is Tunercat for OBD2. Again, it's very good.