How loose are the rockers supposed to be?

[turbojimmy]

I'm changing the valve cover gaskets on my car and noticed that on the driver's side the rockers are very loose. Obviously I know when they are not opening there's limited tension on them but some seem really loose. The car has developed drivetrain noise over the years (though had noise even when the rebuild was fresh) and I suspect this is why. What's going on here? Wrong rods? It only has about 10k miles on it. Maybe I'm concerned over nothing?

Thanks,
Jim