help me to understand cams

Comp Cams has some decent info

http://www.compcams.com/Pages/413/cam-timing-lobe-separation-angle.aspx

http://www.compcams.com/Pages/416/valve-timing-tutorial.aspx


http://www.circletrack.com/techarticles/ctrp_0701_camshaft_design_science/viewall.html