knocking sound (or pinging) is very hard to describe.
if you can hear a metalic sound or if it sounds like "shaking a can of sand/marbles" or a rattling sound ...when u accelerate your engine, then your engine is knocking.
Guys I need to know what are the mods i need to do in order to use on GT45r as cheapest as can of coz,currently my engine is stock however with 4G67 block and crank the same also and already have 1.5mm metal...