I hydrolocked last christmas. next day we did about four oil changes straight. It started after a while. Then a few weeks later. on an onramp, My car dies and I hear a loud pop. I moved the car to the right with whatever momentum was left from accelerating before the pop. Turned off the engine and it never came back on. All i heard was grinding and popping whenever I tried to start the engine. When the tow truck came and lifted my car, I saw a small piece of aluminum underneath the car. I assumed it was from the block. At the shop that installed my new engine, they showed me my old engine and there was a hole right about where the third cylinder was. my assumption was right. I guess we didn't get all the water out. should've tried 5 or 6 oil changes.

sorry for the long post