I have an 1989 bayliner 19 ft with the omc ford 2.3l, i had water in the oil last summer so we changed the oil a few time to get water out of the motor, i was sent awat for some training, but we just moved into a new house with an extra garage, so back to the boat, i checked the manifold and no leaks, so i was looking for a compatable ford block and was read that the serial number woould be on the port side near the bell, well i didnt find it but i did find what looks to be a weld on the block, im not really sure, i plan to replace the block as soon as i figure out which one will work but now i curious if this could have beed the cuase of the water in my oil