you can use long divion
0.2
006 (ignore the noughts)
0.01% of 006 = 006*0.01/100 = 0.0006
0.00006 or .006%
.006 is smaller.
.004 to .006 in. on the intake and .006 to.008 in. on the exhaust
Intake: .004-.006 Exhaust: .006-.008
.006
.006
6%
3/500
1.6667