Who makes a chrome timming cover for a 428 FE ?

[Jon Miller]

From a theoretical point of view the rough cast surface would radiate heat much more efficiently than a smooth polished surface due to the much greater surface area of the rough casting-just like Sizzler said. Think cooling fins on an air cooled motor.

BUT aluminum dissapates heat better than cast iron and the Edelbrock pump also moves more water than the stock cast iron unit. Then there is the fully ducted/shrouded aluminum radiator, and the oil cooler, painted vs coated vs bare metal, aluminum heads and intake vs cast iron.........Let the test runs begin, but not in my garage, I'm not smart enough for more than one or two variables .

-Jon