Hi,
Just replaced my valve/cam cover bolts with new chromed Allen headed ones from Custom Fasteners, they list an engine cover set but it does not include the cam cover.
Got the sizes from my parts book (CB750F1) they should be the same for your bike, they have to be ordered individually from their website, the sizes are:
No. Size Postion
10 6 X 63 6 forward 4 back, ordered 65 mm size
4 6 X 40 2 each end
2 6 X 75 Breather cover rear
1 6 X 50 Breather cover front
The Honda manual states 5.1 - 8.0 ft-lbs for 6mm screw, I've just bought a set of Allen screw sockets for my 3/8th torque wrench from Machine Mart.
Cheers
Den