Got a call from a poor guy who was chasing his tail. He had a 245 degree cylinder head and a 185 degree manifold. His top radiator hose was 190 degrees and the bottom was 178 degrees. He wondered what to make of it.
Our answer; perhaps nothing.
We collected data from a research paper that pondered the same question. Here is what they found.
What makes deciphering the multitude of temperatures even harder is the quality of the reading often provided from a ~12 infared gun of dubious quality.