Ram charger 4x4 360, 0.30, 9.2:1 compression, stock heads, aluminum intake. Stock radiator 160 thermostat summer time it would over heat on long uphill pulls so I swapped it out for an aluminum perfect fit 2 core which fit near perfect. The width heidth and thickness of radiators are near identical. The aluminum radiatordropped temp two gauge notches. Winter comes along and pow 35 degree days and I get 65 degree heater temps that wont do. I pull thermostate, install 195 thermostats, it runs 1 more notch up the gauge and heater temp is in the 85 degree range. Thinking of going 210 thermostate.
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Silver is the best heat conductor followed by copper a close second and aluminum a distant third. But radiators are not made from copper Too soft. So radiators are made from brass a combo of copper and zinc "brass" is half as good as aluminum at conducting heat.
WELL that came from Richard Ehrenburg, SAE that's good enough for me as I have not been steered wrong by his advice tech or articles.