[Psycho71]

I shrouded my electric fans on my '71. Have a 16" and a 10" on an aluminum radiator. Driving on the hwy it would run a little warm. I cut some relief holes in the shroud to let the air flow freely and it helped the hwy temps. Still runs good and cool at low speeds too.

Before the alum. radiator, I just had the 16" zip tied to the 3 core brass and copper rad. itself, and it wouldn't cool for squat in 100+ temps at low speed/idling in traffic. Did fine on the hwy though.

Also, if you mount it straight to the radiator itself, make sure you have some good padding between the feet on the fan and the rad. core. Road vibration can, and will, eventually rub a hole in the core with the cheesy little pads you get with the fans. That's exactly why I ended up going with a new radiator and built a shroud for it.