G'day Renos.
Inlet = 0.008", Exhaust = 0.010".
Rotate engine till inlet valve just closes (push rod loose). Adjust Exhaust. Rotate engine till Exhaust valve clearance is just taken up but before the valve starts to open. Adjust inlet.
I just downloaded the manual from here http://www.klassiekrijden.nu/techniek/bsa-1960s-c15-b40-manual.pdf
Cheers