Those who have swapped cams

[EtaSport]

Whether replacing with a stock cam, or upgrading to a performance cam, did you replace all of your rocker arms?

[nando]

yes, it is a must. the rocker arm faces wear to the individual lobes of your cam, you can't use old rockers on a new cam or you risk destroying it. also if you take apart a head and are reusing the cam and rockers, you must mark them and put them back together the same way.