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My engine was overheating at WOT. Then it would start running warm while just running hard. Installed new thermostat, new impeller, and backflushed the system. Still doing it. Installed new manifolds & riser. The old ones didn't look bad enough to be causing the problem. While the engine was accessible, decided to replace all the hoses as a precaution. Problem # 1 was found, the honeycomb engine oiler cooler was partially clogged even after backflushing the system. I took it off & used a straight piece of wire to poke out all the organic debris. Problem # 2 was found by the mechanic, the fresh water hose coming from the outdrive was crushed by salt build up and restricting flow! Problem # 1 didn't cost anything to fix. Problem # 2 cost a bit, but still a heck of alot more then overheating the engine. Just a few things to look for outside the ordinary.