Tuning For Detonation

'One thing to understand is that detonation is not necessarily destructive'

And...

'If you've driven a car that has a lot of spark advance on the freeway, you'll hear it pinging. It can run that way for thousands & thousands of miles.'

These quotes are from a multipage Detonation/Pre-ignition article written by GM engineer A. W. Cline in 2000. You should be able to find the full article on the net.