I remember back when the mechanic was doing the first check-up on my brand new '67 911S. In those days I could be in the garage right with him as he did the valves, etc. But when it came time to check the mechanical advance and automatic rev limiter that first time, he firmly "invited" me to wait outside because he knew I'd flip when he revved it up to around 6500 RPM's! It DOES sound potentially expensive when it's up at chest heighth on a lift and he lets it wail!
George 86T