What cause enough pressure to blow out new replaced freeze plug?

Question by savannahdales posted 6 months 2 weeks ago in GMC

Just recently replaced a freeze plug on the back side of my motor of my 95 GMC, after dropping the exaust, both drive shafts, transmission, fly wheel, cross member etc so that the plug can b reached n changed, as I just pulled on the highway for a little test drive I heard some metal clinging i stopped to check n saw water pouring out from the same placed of where the plug was just replaced... The replaced plug was thoroughly checked for a tight snugged fit. So wat could cause it to blow back out?