Now that MGC has the carb boots back in stock, I'm about to re-install my stock airbox on my Cal 2. There is a "port" on the bottom face of the box about 1/2" dia on the CARB-SIDE of the filter; now what the heck would that be for? I had it taped off when I previously used the box to prevent un-filtered air being sucked in, but it bothers me now that it's even there and I can't imagine what its purpose is. The "port" is actually a stub-tube sticking out that has a bulb-ed edge, as if a hose should be clamped to it.
It looks like it ALMOST lines up with the tranny breather screen on the topside of the tranny in that area, and if it was to be used as a PCV device, I could buy that. But it doesn't quite line up.
I'm going to install the box with this port blocked off again, but it just bugs me.