The LS-1 motor is stock. the tune is mine, not considered part of the LS-1 though. the differential is not stock, 4.10 gear was swapped and it did not come equipted with Nitto DR's, so I added them as well.
How many passes did you make before you ran a 12?
my first pass was 13.2, the next 2 were 13.0s. they were with the stock original clutch with approx 20K miles and I had owned the car all of 3 weeks.
I thought that wasn't bad and was happy the motor seemed pretty strong.