Look at post 11 in the link below. It belongs to IanC.
https://forums.pelicanparts.com/porsche-911-technical-forum/1127411-curious-about-how-well-3-0-sc-should-rev.html
Over the last two summers I hit 6500 rpm almost every day. Newish valve springs, stock rod bolts, stock everything. Look at how strong Ian's pulls between 3 and 3.5k rpm, no dip, impressive.
Phil