The new fan is a 2,500 CFM fan and I'm replacing a 2,190 CFM Flex-a-Lite S-Blade 336 fan so the performance should be similar. The main difference is the new fan is much thinner (3.187" thick). I had to switch to a thinner fan in order to insert the shroud. The original electric fan just barely fit at 4" so this new fan allowed for the .75" thick Champion fan shroud.
I retained the original Flex-A-Lite 31147 adjustable fan controller. I'll need to adjust it as I don't think it is set all that well right now. However, it is connected and I took the time to carefully do all the connections properly with heat shrink.
I barely have enough space between the back of the fan and the water pump pulley for a fan belt to slide between. This is about a close as it gets.
I've had incidents when the Mustang has run hot without the air conditioning system. My understanding is the fan shroud should help this a considerable amount. I'm hopeful this improves the performance of the cooling system. It will probably help a bit more than my water pump pulley is a little smaller in diameter as it will spin a big faster now.
The original water pump pulley was 6.25" in diameter. I switched to a C6AZ-8509-G water pump pulley which is 5.82" in diameter. This will spin the water pump about 7% faster which is not much but should help a bit at idle.
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