hello. i'm new here, and new to what everthing does. i'm trying to learn what everything does, and i've been researching and reading forums and all that to help me understand . but, i was looking on google to see what cams do, as well as the header. . .
i couldn't really find anything on what it does. . . so, if someone can kindly tell me, what do cams do? what does the header do ?

thanks in advance.

 

http://auto.howstuffworks.com/camshaft.htm

read that first and then ask questions

 

hey man. thanks.
that really helped me a lot.
not just with this, but with how the engine works overall. thanks