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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
And LS1 vettes are capable of 12s, but they usually run low 13s at the track. I think the Corvette drivers are "the new guy at the track" more often than not. I beat a 06 Z06 newbie in my 85 vette for that reason.
On average most LS1's I've seen run low 13's and L98's run low 14's. Thats with an average driver and little to no mods. Depending on driver, weather, and traction those numbers can swinger either way.