I was told by word of mouth that there is a way to swap a ls3 pcm to work with a ls1.

I think its bs, but just for conversation sake is it even possible?

 

You can make anything work with the right amount of money.

 

has it been done already?

 

you need a converter box to get the crank from a 24x reluctor to a 58x reluctor...
I believe Lingenfelter makes one

or you need a crank with a 58x reluctor on it.

then you also need a 4x cam wheel, and an LS3 cam with the 4x cam gear on the back
if you want knock sensors, you need the newer 2 wire style
and if you want a working set of gauges, you need the dash out of the pcm donor car, or a set of aftermarket gauges and seperate sending units for them.

theres a whole slew of things you need to make an ls3 pcm work in an ls1 vehicle...its pretty much a cut and gut and start over on the wiring

literally nothing from an ls1 car works on an ls3 pcm...

making an ls3 motor work in an ls1/ls2 car is a much easier task.