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Message: <blockquote data-quote="whiplash473" data-source="post: 1062222" data-attributes="member: 17027">here's one of the better videos i found......the cam is the shaft that runs thru the middle connected to the 16 thin rods (push rods).....those push up the rocker arm and the rocker arm pushes open the valves.....different cams have different lobe lifts and different valve opening durations which causes the engine to run differently.....if you get to the point of getting a cam just remember its much more important to run a cam that improves your engines performance rather than just getting a big cam simply for the idle like way too many people do [video=youtube;N2y77vEKorI]http://www.youtube.com/watch?v=N2y77vEKorI[/video]</blockquote>