when i was researching which fan and what to use etc i read that a fan in a 'push' setup (infront of the radiator at front of car) is 15% or so LESS efficient than having it as a 'pull' setup. although i cant see the picture anymore as it looks like a blackdot, thought id just say. i couldnt fit mine as a pull but it works a treat as a pushing fan. 12" fan kit from repco and davies craig controller, on an old gemini radiator w/ overflow.

with the repco/aftermarket fans, you can switch the direction of the blade so u can use it as a push or pull.