I am less conservative than Larry I guess, I have been reving my stock head with 272's to 8,000 on a daily basis for over a year without issues. Now on the 05 I have (being installed on Monday) a stage 3 head from Buschur Racing, and will rev that as high as Dave says the stock bottom end can take without comming apart
Larry is correct on the other issues. Way to much variation to tell you any real answeres.
Keith