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Electric Fans:
Primary Cooling
Determine the surface area of your radiator core by multiplying its length and width; your primary elecric fan should pull through at least 70% of the overall area. Pullers are preferable to pushers; use a pusher if no space is available behind the radiator to mount a puller, or it used as an auxiliary fan. When choosing a fan for V8 engines, select a fan that will pull at least 2500 CFM.
Auxiliary Cooling
Use a pusher fan mounted in front of the radiator to avoid interfering with the belt fan. Choose the largest fan that will fit to push air through the radiator or a/c condenser, or both, depending on your objectives.
Belt-driven Fans:
Determine the fan rotation
Look at the direction that the fan moves while looking at it from the front of the vehicle. If the fan rotates clockwise, it is a standard rotation fan. If the fan rotates counter-clockwise, it is a reverse rotation fan.
Ensure proper clearances 3/4" from outer edge of the fan blade to the shroud (with less clearance, engine movement could result in fan hitting shroud; more clearance results in lower efficiency).
1" minimum from the leading edge of the fan to the radiator core or closest obstruction.
1/2" minimum from the trailing edge of the fan to the pulleys and belts.
You may need special spacers to position the belt-driven fan properly. Multiple spacers may be used, up to a maximum of 3".
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