PCV is ticking

[Steelrat]

My PCV is ticking away and valve cover acting as a resonance chamber. So I get a new PCV, same thing. So here's the thing. The PCV is opening and closing at idle like a fast heart beat. Should it not be either open or just closed? The vacuum coming off the carb spacer is real strong and feels constant. I am thinking the standard PCV I am using for my application, sb 400 is too heavy and the vaccum is not enought to pick up the steel ball in the pvc to keep it open at idle. If so, how do I find correct one?

Thanks