I found this to be a very good read for a newb like myself so I thought some might want to read the write up as well.

talks about engine knock\detonation and pre-ignition
http://www.streetrodstuff.com/Articl...ne/Detonation/

Maybe pinn this thing up top it is very informative

 

link doesn't work. there seems to be the 3 "..." in the middle of the URL that is messing it up

 

Thanks

EDIT: re try this KNOCK

 

FIXED***