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Old 07-20-2010, 01:30 PM   #2
6772owner
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Join Date: Jan 2008
Location: Colorado
Posts: 1,193
Re: Flex Fan vs Clutch Fan

After my personal experience with my 67' K10 I would say to go for the regular clutch fan. The flex fan was not able to pull the CFM I needed to keep the engine cool. The flex fan is "running" all the time (and sucking power all the time) were the clutch is able to engage/disengage based on the temperature. The flex fan is called a "flex" fan because the blades are supposed to flex and cause less drag, but they are also not pulling much air when "flattened" out. I will never use a flex fan (and never have, the PO had installed this one)

Just my $.02
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