Help!!! Lost An O2 Sensor... Am I Safe To Drive???

[BowTie Eater 5 Liter]

i was driving down the highway, and my motor suddenly sounded like it had a bad exhaust leak, so i thought i might have blew my head gasket (i advanced my timing today). i get home, and ask Unit5302 how to check if my head gasket is gone, so i go out & try what he said, but no luck. then i run the car trying to find where the leak is at, and as i get down on my stomach, i see the end of the o2 sensor hanging on the groung, with no plug(part that goes in the h-pipe).

well, what do i do??? am I safe to run it with only 1 o2? what size tap would i use to try & re-thread my h-pipe hole for the o2?? could i just stick a bolt in there for now, until i get another 02, or should i immediatly get one???


Thanks a million