i got crysler charger I bealive its 1983 model when i got this motor it run great but last weekeng i took to lake run about 2 hours and suddenly lost power, took it home checked , only 2 upper cylinders were running (all 4 had sparks) plus mix of water and oil was coming fron exost so i ges it blue the head gasked i took the head off gasked looks ok, checked the oil in lower unit find water in it . now so confused can anybody explain what is going on .. I worked on cars but it my first outboard motor , thanks