If you made it 500m I would expect there to be signs of water in the intake system still, wet air cleaner, some stains... It is possible that you injested enough to cause an event that damaged your rods and further driving allowed that to **** shit up, If You didn't intially injest enough water to stall the engine its possible that driving cleared enough moisture out and assuming your engine was hot it would also evaperate alot of moisture but would still expect to see a sign of water.
The volume that went in is unknown at the end of the day.
Every man should have a V8 ute.....with a Chev badge.....and a Southern Cross sticker! Mods? What mods?