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i think you have a small leak into the coolant somewhere, building pressure which blew the bypass hose and torched the old radiator.
i would do another cooling system pressure check and leave it on a while to see if it is dropping even the least little bit, then i would do a leakdown on all the cylinders with a leakdown gauge.
from there you know you have a good system and can look at other possibilities if nothing comes up.
in addition, if you had a steam pocket leave the engine which is coolant coming in contact with a hot cylinder and enter the radiator it will tear up a radiator pretty quick.
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