This is the scenario.. I have a engine and the block is made of cast iron which is 1/2" thick. The internal temperature of the engine within the cooling passages is 260° F Is there a way to calculate an approximate surface temperature on the outside of the engine block? If so, what would the temperature be? Say that there was another cooling passage on the other side.. if the passage behind the 1/2" of iron was 260°, what would be the second cooling passages temperature?