Maximum rpm for SB

Okay now I got to tell you all that my little 318 that has been running for the last ten years has regularly seen 6500 rpm and on a few occasions over 7000. it has gasket matched heads with bowl work, 280 dur .480 lift comp cams cam w/springs, hypereutic pistons, ballanced and she still runs great, this winter I will be tearing her down for the first time to see what the damage is.