my engine block has just started pissing water from both sides of the block. the water in spraying out of a small brass port on each side just under the header. the spray is about a 16th of an inch wide. what are these ports? and why has it just started happening? the motor is running fine and i have no water in my oil. I just purchased the boat this year and am starting to think the guy had the drain plugs in finger tight and they have just now vibrated out....maybe. please help me internet!