Try it by all means. Actually, I remember Kodak showing a sequence of up to 12 stops without any quality loss. I tried to behave myself with saying 8 stops. I don't have an 8-stop example around at the moment, but I attached a 6-stop example. If you look close, you'll see that the ASA 400 film (left) exposed at EI 6 (right) gives more shadow detail and shows no degradation in the highlights. Overexposure is no problem, but you may notice a slight increase in grain with 35mm film.
when you overexpose sooooooo much(6 stops in this case),
how do you factor development? I mean, its kind of hard to pull 6 stops in development....