I noticed when adjusting valves recently that 4 out of 8 intake rocker arms have play in them. In the pic it is the 4 with the green arrows above them. also, on the rail they are attached to, the metal thing that you can see between the pair of rockers has play in it as well. but it is only on the four on the left. the four on the right and all the exhaust ones are tight and have no play at all. by having play I mean if you hold it with 2 of your fingers, you can slide it slightly back and forth from left to right.
is this normal or do I have trouble coming my way?