I am lead to believe that yes the cams from a early gsxr 750 motor will work on a B6 engine, and small gains will be made, where as if the gsxr cam in the B12 makes big gains. I was going to do the very same mod myself, but I figure the work needed was to much efen around, rejetting the b6 carbs or rejetting gsxr carbs, to suit the cams. So for now I'm just letting the minister of war, she who must be obeyed, wear out the 600 motor a bit more. Then I'll just shove the whole gsxr 750 motor in the B6.