My '99 1LE came out of Cali 8 years ago, the engine was not original and was listed as an LS6. Since it didn't have the original engine in it, I'm trying to find the origin of the PCM. Can anyone decipher these numbers ?

http://i1137.photobucket.com/albums/n506/9...e1/PCMLarge.jpg

That's the standard LS PCM of the era from 99-2002.
The Calibration ID # & tune in the PCM might be another story.

Thanks wrencher, I know the tune is heavily modified from stock, and it was used with a 6spd F-body. I'm not familiar with the LS PCM. The car came with only 7 pistons, and I used the PCM that came with the replacement engine. I've tuned the LT PCM with LT1 edit, but that's the extent of my experience.

If you've used edit, with the LSx software out there will be easy in compairison.

Useful link:

http://chevythunder.com/LS1%20components.htm