I was thinking about upgrading my rockers to 1.8s or something,I am on a stock cam.Is rocker selection important if you have nitrous?

 

Not as much. Higher duration rockers obviously increase the lift, which will cram more nitrous into the cylinder, but without the longer duration, so you could expect to see a little more output on the bottle with same size shot, just like you'd see a little more off the bottle.