Or, it may have been vapor locked, if you got a cracked head or leaking head gasket and got coolant vapor in even one cylinder that would be enough pressure to seize the engine. If, after it has cooled you still can't turn it then you are probably right and have some siezed bearings.
That happened to a '76 98 I owned a few years back. #2 rod bearing siezed up tight.
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Dan
'77 Cutlass Supreme
'46 2 door
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