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Cam problems

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I had a knocking noise in my 07 kx250f and when I took off the belt and the cams I saw grooves in the cams and the can journals, could this be the cause of the sound? I heard it's caused by lack of oil and something clogged in the system, but what should I look at next and is this salvageable? What do I need to replace? I'm pretty new so sorry for all the questions but I'll have pics in a moment

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I do believe that cam and head are done for.  It was likely caused by an oil supply issue. 

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Thanx for the info, one more thing, could the this be cause of the knocking sound my bike had before? Main crank bearings are fine I checked them out

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Thanx for the info, one more thing, could the this be cause of the knocking sound my bike had before? Main crank bearings are fine I checked them out

yes it can be, any gap created would make a knock sound when pressure is put on it from the valves.

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