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Shroud

I just bought a shroud for my radiator, what kind of difference should I expect to see with the shroud now? 5-10 degrees?
 

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IIRC a thermostat (installed) restricts water flow slightly. Thus, water "lingers" in the radiator longer and cools better.
Not entirely true. The restriction of the thermostat creates a turbulent flow which cools a lot better than laminar flow. Circle track cars use water restricters to accomplish the turbulent flow while maximizing coolant circulation. The restrictor will cool the enginer better than without one.

If you put a thermostat in and it runs significantly hotter than the thermostat rating, that's an indication you have another problem with the cooling system. If you run a 160 thermostat and your engine runs at say 190, the 160 thermostat is simply a "band-aid" compensating for an inefficient cooling system.
 
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