1965 Dart, 225, Crankcase ventilation and exhaust pipe.

Just pull up on the cap, the PCV valve has a nut on the inside

Yes, I got it off. Looking at the new one on classic industries gave me the hint that this pulled off. I did have to pry a bit, not sure when or if it had even been off! Is there supposed to be a spring inside? I cleaned up the valve, still rattles, so I think it's good to go back on.

Thanks!