The one at the top?
Or the adjuster bolt?
Check your water pump for operation. It's possible it may have seized.
What was the status of the belts before and after?
What were you doing when it blew? Throttle position, AC, heat, speed, engine temp?
Mine was fully warmed up, was summer time, I was WOT entering the interstate with AC on. The belts were shytty aftermarket clogged version and I had not flushed the cooling system yet.
After I got up to 70...
I recommend changing thermostat, PHH, and literally every hose related to the cooling system. Rear heater hoses, heater valve.
Because everything has aged and has seen a pressure spike.
I was also concerned about the HG when mine went. Mine blew at 225K and the HG had been replaced at 145K...
I am guessing that you lost your fusible links since you pulled the battery box to do the radiator.
Also, if the alternator got soaked in antifreeze, it's possible it smoked that as well.
I had literally the same issue with my radiator exploding like that. I think my alternator went out about...