I am looking to replace my mechanical cooling fan with a electric one and know there are links for this but they talk about ideas to get fans from Taurus or HHR's for smaller engines but nothing really for the 5.2. I know the factor fan is 19in and I am sure I could find a e-fan that size, if not I can go with a 16in. I plan to reuse the factory shroud and have a controller set at 200° to kick on and off, the only thing I am really missing is what is the minimum cfm rating I need to keep the 5.2 happy and cool it efficiently with either a 19in or 16in fan.