Block Strength

If I was a betting man, I'd put my money on you over revving the motor in the water, snapped the rod, and took out the block with the shrapnel. there's probably as many engines blown up at the stirip by being overrevved doing a burnout as racing. If it had hydrauliced, there should be major signs of the rod bending before it broke. That cylinder didn't have time to fill with water. At 6000 rpm with all of the cylinder pressure in there there's no way it could fill that fast.