I think that all this is mainly about the airflow.
On the older Marks there were relatively big intakes, but small or badly placed "exhausts", which caused that hot air couldn't escape fast enough.
I believe that evolution of the air ducts and engine covers on Mk.IIIs should fix that. They removed air ducts, but added a massive grill to the rear. With the slightly bigger intake hole in the divisional plate it should guarantee the optimal airflow through the engine compartment.
Coolers and all the rest remains the same.
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UCw Mk.III
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