is this a good cam for NA and N2O ???

[Slimsilverado]

how about a ls6 cam.. i think its a 206 / 218 with 551 lift with 117.5 lsa ???

[Madd Maxx]

Close. It's 204/218 0.551/0.547 117. Because it has a smaller base circle, it requires longer push rods and uses a late intake valve closing to extend the RPM range into the mid 6000's. There are better choices for your truck.

Why don't you give us a better idea of what you're trying to accomplish. We could then recommend an appropriate cam that would work for you.