Looking at a boat with 575's that have 225 hours on them. I have been told they've never been touched other than regular oil changes.
Haven't had a chance to have a leak down done yet. Can I expect that the motors will need a valve job? Outside of this, what can I expect.....

I just went through a board members 2001 575 sc's. At approx 100 hours. The head gaskets were gone. I could see daylight between the valve and seat. Also pull and inspect the thermostat housing. It was about corroded closed which I believe was the cause of the problem. This will also be a good indicator if they were flushed or not assuming they are salt water motors.