I have turned 7200 rpms consistently with a 350 that i have, 2 bolt main, no main studs, stock crank, scat rods with arp bolts. The motor has been together for 3 years and is on the stand now still intact, just gonna freshen it up. It has seen 7600 several times and has hit 8 at least 5 times. I think people underrate the strength of a properly maintained and well put together motor.