Normal vs Abnormal symptoms of running overheated?

[mthomas58]

I've got a tired moter in need of a rebuild that shows multiple symptoms when running hot. As soon as I get good airflow and lower temps to normal level they dissapear entirely and the engine runs great and pulls strong. What's normal and what is specific to a tired engine (180k with oil consumption of 1 qt per 400 miles)

1) Rough idle
2) Chain rattle
3) Occasional belt squeal
4) Noticable decrease in HP

Thanks!

[dan79brooklyn]

My old SC would get hot at track days and would noticeably be down on power.
It otherwise ran fine, it did not need a rebuild however, but would have benefited from an upgraded oil cooler.