Hi mate,
The sharp clicking noise could not be heard at idle, and even when you reved the engine. it was very hard to tell if you could hear the noise or not!….
But once you were on the road (under load) there it was !….. When it first started I was convinced that it was piston slap, and I thought that I might have damaged one of the pistons (again)!….
The strange thing was it never made the noise from cold, if it had been piston slap it should of been at it’s worst at cold It was most annoying when driving normally Under light or hard throttle from 1500-3400 rpm as the revs went higher you seem to lose the noise? Most odd, it had me going for months before it gave it self away
When is you noise at it’s worst?

Hope this helps.

CheeRS

Steve.