I don't want you to think I'm accusing you of lying bud. My only intension is to educate. I don't doubt you beat up on a lot of LS1s at your track.
The reason why I posted is because out of MY own experiences and sources of information, I see most stock LS1s(Z28,SS,T/A,WS6,FORMULA) putting their cars in the low 13s STOCK on STOCK Goodyear F1s.
The replies I am getting are mostly low 13s. The ony ones I see with high 13s are those with little miles on their car, disgusting 60 fts times(meaning they can't drive), or the newbie that ran his/her car once or twice stock and immediately modded their car.
So far the average is 13.304 out of the nationwide responses.