I don't know for sure, but I would think it would have to be deep in the 13's considering what I've done with a stock longblock. There was a web page that categorized B-bodies by what they had done to them and what they ran, but I can't remember where it is (I just looked) Here's a list from a popular impala SS site of member's times, some telling what they have done, so maybe you can figure it out based on what people say they have. http://www.impalasuperstore.com/nais...s.asp?catID=10

Why are you asking?