Originally Posted by Kingtal0n

I used these fans successfully in turbo V8 swap.

I think it can handle SR

One of the main things is the shroud around the fan. The area between fan and radiator, has to be fairly air tight to work well. Especially for dense radiators with condensers and intercoolers in front of them.
To do this cost effective, I take junkyard flexible heat barrier materials and sort of wrap it around the shroud/radiator to close the space.