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Strange. I've never disassembled an M37 distributor cap, but I've smashed dozens of civvy ones back in my somewhat destructive formative years, and they were all solid. I can't envision a piece of porcelin between the rotor contact and the wire connector. Porcelin is an insulator! I'd think your ohm meter would read "infinity" since no current should pass from one side to the other. I'm an "electrician," not an "electronics technician," though, so I'm open for enlightenment if I'm mistaken in my assumption.

i can not belive that someone has not went out and cut a cap to look at it or someone that has more knowlage than me (that does not take much)..there has to be curiousity out there as to what is inside

Generally porcelain found between metal contacts will usually be housing a resistor just like the ballast resistors often found on firewalls. When I Ohm out cap posts if the resistance is high on all the terminals and they are clean and undamaged then I just assume they are resistor type. It would become an issue if one value was way out of line with the rest.