I have a new to me 98 Donzi with twin mountain 350s. Port engine runs at 160. Starboard runs around 170 to just under 180. If this a huge problem. I just changed impellers and I don’t recall cit being an issue before I changed them. Is it possible I hooked up the raw water pump hoses backwards which is causing the higher temp. Neither of the old impellers were broken. It was preventative maintenance. I don’t have a water gun and haven’t pulled the thermostat yet. First boat with twins so I’m not sure it it’s normal.