Well...if you're talking about stock it's hard to say, you can rev it up to 10K or maybe even 11k all the time, but eventually it's gonna break something...it's more a matter of consistancy than a one time thing. I'd say your stock valve train will do 9K regularly without breaking, more than that, and you're pushing it.

If we're talking about after market, then I guess the sky's the limit, provided that you have an endless buget and a very good machine shop. For example, John at Ferrea says their head components will hold up to 12,300 rpm.

I guess more to the point, most cams won't make power past like 9500, some of the more radical ones up to like 10,800, but that's about it for street cams that make power anywhere else. So why beat on your car any more than necesary. Most of the companies I've talked to such as Rev and Ferrea all say that anything over like 9800 rpm will take its toll on your valve springs, and will at some point in time require replacement, though signs can be difficult to judge without removal. My rev limiter is set at 9700rpm for the moment.

Every one is going to have a different opinion about this one, but that's mine...

Later,
Aj