[RalphG]

The only time the temp ran that high on my 52 Merc was just before the radiator tank blew open on the top tank seam. And it was in winter! I had the radiator covered to bring the temp up to normal. When it started to go a little higher I didn't think it would be a problem but guess the old tank seams were not up to the pressure. I've never run in any temps over the 80s but mine runs just over the middle of the heat guage. IR gun on the heads at that point shows right around 180 degrees both sides.