I do hope your referring to the vehicle 1992 Legend and not your own Head. Acura Legends are V6 equipped motors there would 2 "heads" I'm assuming the water is present when the oil filler cap is removed This is a serious indication of which I recommend having your Legend inspected (Dealer service or Qualified repair shop) for any damage or needed repairs.
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I do hope your referring to the vehicle 1992 Legend and not your own Head. Acura Legends are V6 equipped motors there would 2 "heads" I'm assuming the water is present when the oil filler cap is removed This is a serious indication of which I recommend having your Legend inspected (Dealer service or Qualified repair shop) for any damage or needed repairs.