Arguably, the shroud also helps when the car is not moving, as it prevents (
to some degree) the tendency for the fan to recirculate its own hot air. (
the air pulled through the radiator is
otherwise free to return to the front of the radiator) Of course the shroud
is not a very good seal, but it probably increases the chances that the
radiator will be drawing some fresh air in through the grill. Every little
IMO it only helps with overheating at speed, so if you don't have that
problem, I believe you could safely leave it out.
> I've noticed in the Big 3 parts catalogs that they show a radiator shroud
> for the TRs. I've had a '58 TR3A for 21 years, and have never had such a
> shroud on it. It was apparently missing when I bought the car, but I dont'
> remember ever seeing any screw mounting holes in the shelf of the front