I was able to dig mine out for a look. These are for the non-cnc bare SB heads. The boxes are 5x9x23 inches and weigh 23 pounds each. The packaging is functionally adequate but nothing more. My heads were shipped together in a secondary box and made the trip with no damage, even though the outer box and both inner boxes suffered some holes and rash. The inner packaging is a sheet of 3/8" styrofoam on the valve side, with an extra cardboard cover over the manifold surfaces.
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I went searching through Parts Mountain, and I could have sworn I had one of these but if I do, it's not going to be located any time soon. :(
