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401 radiator spec.

My 401 overheats at speed. It is possible that there is insufficient airflow through the radiator which is therefore not doing its job of cooling. Looking at it, the fins are mighty close together and I suspect it is incorrect. The flow of water through the radiator is good, so I know it's not blocked. Does anyone know what the specification of the radiator should be? 

Here is a copy of the specification from the workshop manual. Yours may have the radiator shutters or a conventional thermostat depending on its age. Others who are more knowledgeable may be able to provide more detail.