the k20a/a2/z1/z3 generally won't make power past 8600 rpms on a stock longblock whether it be all motor or forced induction.
i have cams in my setup along with aftermarket valvetrain and i'm revving to 8850 but with cams i'm sure i'm making power possbily up to 9k. but i leave it to 8850 because past that the stock rods will take a **** lol.
it's brian with the yellow ep btw