I know you are definitely not going to attempt to do that, but as the Nike Philosopher stated, "don't do it."
Anyway, I really thing it would vary depending on individual back ground. My brother for example took the verbal section of the old AAMC practice section 3-11 and got a grand total of 4 questions wrong over all nine verbal test and also finished with at least 15 minutes to spare on each. I on the other hand could not just get up and achieve the same. Some people could easily score in the 508+, but I do suspect that most would have a difficult time scoring about 500 without studying.
However, I have good news (I just save money by switching to Geico), but seriously the good news is you are able to study and do extremely well on this test, so there is no need to find out first hand. Again, I do realize that you had no intention not to study. This will vary from individual to individual.