another 360/408 over heating

OP. When you make a shroud or buy one... you want flappers over the holes so that the fan pulls through the radiator and not around. Flaps close with vacuum from fan but they then open air speed is greater and still allow the airflow at cruise.

Volvo wagons have very nice light weight cross flow style shrouds that house the fan, great example . If you're even gonna bother with a shroud, it should have trap doors.imo

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