hmmmm .. now that says more than your original post I assumed they were smakin the top.
Ya got me also never in my years had rockers slam the intake side of the covers....Wow ...never had or heard of this problem.
Im sure someone with some serious small block knowlege might chime in with a solution.
but it seems like your rockers are the problem..just dont have a good way to point ya.
AINT THIS HOBBY FUN!
Tim