Hello all, New to the forum and need some assistance. I have a 77 nova with twin 302s in it. I have a problematic starboard engine. Here are the details of whats going on. I have no problems with the motor under 3000rpm. It will stay cool but over that is a different story. When I bought the boat I did some routine maintenance and replaced the impellers and drive oil. The port impeller was alright but the starboard was wasted. Since then I have replaced the water pump, taken off the risers and looked in the manifolds for water...none was found and actually they looked good. I'm stumped what to do next. I thought maybe I should disconnect the power steering cooler and see if there was a blockage but was told this is a long shot if its not overheating at idle. the temp kinda bounces up, not a steady rise and when its gets around 200 I shut it down. The thermostat is out and there are not any obstructions in the cooling lines. She runs like a champ and isn't knocking or anything. Just have no clue what could be wrong. There is no water in the oil, so a crack in the block or manifold is unlikely. Anyone have any suggestions? Thanks everyone!!