Had an issue with the temp getting up to around 180 running at RPM below 3000. Idles at normal temp but with, to me, a weak stream, replaced water pump and all housings as well as popit rebuild and seemed to be ok but didn't get to run it much. Haven't been able to run it since last summer took it out yesterday and started heating up untill RPM gets around 3000 again and temp falls back to about 140. Water pressure is around 3psi at idle and comes up with RPM to around the expected 15psi.

Any thoughts before I tear into this thing again? I'm new to these black engines and search this site often but haven't found this issue addressed, at least so far and any thoughts are appreciated.