396: I have a 350 that wanted to run hot at idle. I went to an aluminum radiator and that was a big improvement. But still wanted to creep up there. I went to the additive FOURTY BELOW and a twenty two pound cap and another big improvement. I am running a mechanical fan and electric in front. Another thing I found is a lot of temperature gauges are not overly accurate. The higher rated cap and 40 below are a cheap solution that will give improvement. Dave E Shank
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