strange noise from valve cover??

[Stpndsmnn at aol.com]

I've been in the process of putting my car back together after replacing the
blown head gasket.  I had everything mostly back together now and I thought
maybe it would be a good idea to spin the engine over with a bar just to make
sure nothing touches that shouldn't.  I am not having any valve-piston
problems but I did notice and odd sucking/breathing noise from the valve
cover.  I can't decide if that is a normal sound or if it is a sign that a
valve guide or seal has gone bad.  Before doing the head gasket I wasn't
having any problems with blow-by out the breather tube or out of the oil fill
in the cam cover so I don't know if I should be worried or what. . .

For now I guess all I can do is finish up and see what happens, but if anyone
has any thoughts on whether this is normal please let me know.

Thanks
Matt