Hydrolock???

'Hydrolocked' means that there is so much water in a cylinder that it starts to rotate but then stops dead when the water & air in that cylinder compresses to almost solid. So, if your motor is spinning so much, then it is not technically hydrolocked, but that does not mean it does not have a head gasket leak either. Did you ever run a leak down test? I would not be pulling heads 'til I did that to be sure....though your prior thread certainly did sound like you have something blown. If you do pull heads, you can just slap them back on, but I would have the heads checked at a machine shop to see if they are warped ffromt he original overheating incident; otherwise you will be back at this again.