yeah that makes sense
timing is where the lobe is introduced in the cycle (720 degrees cus of the 2 revolutuions per 1 power stroke) and duration is how long it is opened, lift is how far it opens. you want it to open as far as posible without smacking in to the piston
many people regrind cams by doing so they change the base circle that by shimming the valves you get effectively longer/higher lobes so more lift and by changing how wide the lobe is (by wide i mean if you are looking at the profile of the lobe down the axis of rotation, where the lobe profile stops/starts to push the valve open) you can get different duration. cam gears effect the timing.
valve-matic is awesome
[u2b]RHNXbGGvOdc[/u2b]
its a more simple solution to the vtec as u dont need 2 cams per intace/exhaust, nor do you need 3 lobes per intake/exhaust on a single cam. there is more mass but less rotating mass, and in effect its just like SOHC with rockers, they are just adjustible. but with 2 cams you can still individually adjust timing. however if they make the cam followers (little rollers) adjustible as well (like in and out) then you can get away with one cam, too complicated but