I turn mine to 6800 every pass.Cam/valvetrain rated to 7500.Have run a few times shifting at 7500,just keeps pulling!!Machinist who setup up the motor said it was good for more.Mine is 2 bolt block with ARP studs and stock caps.You'd be amazed what a prpoerly balanced/clearanced/assembled motor will survive reliably.I'd be more concerned with valvetrain parts( good caps and pushrods) more than anything else