| Actually, I think its the inlet snarl that gives away an advanced cam.
I've run full-race cams on my 450 single, and they had a very early opening as well as longer duration and more lift - they made it very very loud, but especially as far as inlet noise was concerned.
My race 620 certainly has that kind of difference to it compared to my old road 620 (which is now gribs mongster) as it is very noisy on wot, especially compared to the 583.
Certainly the single-can and the twin-can 620s sound quite different, so its difficult to compare them. |