Justin I have a 411 Mk 2 Bristol which years ago I purchased. It was always having overheating and starting problems(when hot). In Australia we get a lot of very hot summer days when the car was almost impossible to drive for fear of boiling. I now have a car that runs cool even in the most severe conditions.I took the following steps
1/ I replaced the inlet manifold with an aluminium aftermarket unit
2/ A new high performance waterpump was installed
3/ I recored the radiator with a modern core 30 % more efficient
4/ High flow thermostat
This all helped but still not solving the problem so I finally followed the advice of my radiator man who told me to replace the 2 Bristol supplied fans which block much of the airflow to the radiator with 2 larger fans which he insisted be installed on the engine side of the radiator that way the full face of the radiator has air flowing through it .
Now the car runs cool on the hotest of Australian conditions.
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