well with plain ol' rods and arp rod bolts, I'd say 7800 is reasonable. If you get those rods shot-peened (which isn't too expensive), 8k should be fine. Keep in mind, you wont be revving it out to 8k every time, that would probably be bad. But if you drive reasonably, and flog it from time to time, that should be OK.

But of course, as with doing anything the factory didn't intend, there are no set limits... those numbers are what I've gathered from various crvtec/lsvtec peeps, but don't take them for the gospel truth. If you know you want to reliably flog a 8200-8500 redline all day, then you should consider going all-aftermarket.