Overheating headache

royslead said

It IS normal for engine temp to rise after shut off, nothing is moving the coolant or cooling it. This is why a lot of newer cars have electric fans, and after coolers, etc. However, your engine definitely has an issue, whether tune related (for sure) or mechanical. What overheating issue did you have early on, at idle? Was that corrected?

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It overheated the same but lower temps. I replaced the radiator and added an NOS fan shroud. That was four years ago. I’ve hardly run the car since. These numbers are at least 20 degrees higher. I am going to measure the fan tomorrow, but it is a more stout fan than the original.
When you say tune related that refers to timing? I haven’t checked that. Could headers cause excess temps more than stock exhaust manifolds? I bought this car new, and the timing was always TDC. Will have to address this too. Could headers cause excess temps more than stock exhaust manifolds and dual exhaust?
I have some work to do.
Thanks for your reply.