1999 Chevy S-10 clattering noise thats in time with the eng

This 98 s10 2.2 has what sounds to be upper valve train clatter that gets louder with the rev, alot like a spun bearing would sound from the bottom. I had to remove the throttle body for access to the valvetrain I have thoughlly inspected what I can see I dont see any busted arms, rods, or springs.I cannot start the engine to duplicate the noise and pin point the issue. A few of the rockers feel tight but seem to loosen when eng is rolled over off of compression stroke. Any advise was hoping not to have to remove the head.