No, they don't.  Mid to low 13's out of the LS1's is the best that I have seen in person.   From what I have seen, the LS2 cars are usually in the mid to low 13s as well, but with higher trap speed.  I think my friend got a best of 13.3x @ 103-104 out of his '04 6-spd when it was stock.  Not the best weather though.  Middle of July.