I just purchased a 1980 16ft Glastron ssv-168 with a 120hr mercruiser. I have never owned a inboard before and have a few questions about some issues that I am having. The temperature seems to be relatively hot, about 180 at plane and 200 degree and rising to 220 cruising at idle. I don?t know what the normal temp should be but this seems a little hot. The engine starts fine and runs excellent, can rev the engine fine. It goes through the rpms fine. But under load like trying to get on plane, it seems to want to stall. But if I finesse it, it is fine. The overall speed of the boat at full throttle 3900rpm is about 25 miles an hour, that is from the dash gauge but it does seem about right. With this horsepower available, it seems that this small of a boat should be able to go a little faster. Also, coming off plane to idle the outdrive has a whine, that goes away after a min or so. I guess the questions would be: what is the normal temp range, average speed of the boat and why does it seem to lack power? Any help is much appreciated.