I can not answer for everyone else, but I switched out the Hall Phoenix radiator for a Ron Davis Racing radiator (which I believe Dennis also sells) and the aluminum ran much cooler and consistant temps. Now I want to clarify that it was an older Phoenix radiator and a brand new aluminum radiator, so that may have had an effect on the outcome. Also this was in Phoenix, Arizona so the temps are high in the summer. Also I have the aluminum Fontana block in my car and although when run hard in summer, it gets as hot as any other as far as oil temps, I do notice that it cools down faster than any engine that I have ever had before.
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