408 still overheating :/

stixx said
Good idea nm9! Or just run the car without hood for some testing. When you then have lower temperatures at all speeds you know how to proceed. The fact that a lot of your changes didn't do anything to the temperatures makes me think that something fundamental is off.
I had a similar problem in my E-body (long gone) with a much lesser engine, but then it simply was the original radiator --> bad "connections" between the mesh and the water channels of the radiator.

Ok i did a test drive today without the hood and i closed the gap between the top of the radiator and the chassie with some rubber:

It was about 86°F outside temp. and the max. water temp. shown on the gauge was 210°F

But the test drive was still with the old water pump from the 318 (i will change again to the milodon high volume pump) and with just the electric fan without a shroud

I have about 50/50 water/fluid in there.

I think i will build a cold air intake maybe it will be better then