So here's where I ended up with my fan situation. To summarize, I have been trying to find a fan that works better than my stock 5-blade flex and here is a list from best to worse:
1. Derale 6-blade flex
2. Stock 5-blade flex
3. Flexalite 6-blade flex
4. Nylon 6-blade flex
5. Pontiac 6-blade clutch fan
6. 428 Pontiac clutch fan
So the Derale is the winner and it's what I will use.
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