How can I tell if cam is oem or hrc?

[bk111]

Any markings?

[d3ktrix]

05 cams or 06+ ?

If 05....

05 HRC top (3 rings on end of cam)
05 Stock bottom (2 rings on end of cam)
http://atvw.sploitz.com/hrc_and_stock_cams.jpg

And a profile shot...
Stock -> 05 HRC -> 02 CRF
http://atv.sploitz.com/Stock_05HRC_02CRF_Cams/Stock_vs_05HRC_vs_02CRF_1.jpg

[bk111]

Thanks