The last 340 was kicked out when I was 2 years old so I can't say much about it they said they are a legendary badass brutal motor that spins up real fast for a damn small block although what I've read what I've heard, from old school Gearheads, half of it may just depend on how the motor was assembled and how it was broken in! I know one guy that bought within his family two identical cars he drove both of them the one his sister dog the hell out of and the one his mama grandma his sister's car definitely hauled *** more and it was the exact same thing, for posterity, Rick was ab actual mechanic * he owned his own shop for 13 years.