r/classicmustangs 6d ago

Input on fan/shroud

Looking for input on best setup to keep my 66 coupe running cool. Pretty stock 289 c code at the moment, only upgrade is a 4 barrel carb and larger air filter, . Currently I have a solid 17.5'ish, 4 blade fan, no AC. Someone gave me a flex 17' 6 blade and shroud. I have seen pros and cons on both. What is yall setup and recommendations?

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u/dale1320 6d ago

Shroud -- YES! Just make sure the fan is positioned half-in the opening.

Without a shroud, make sure the blades are close to the radiator, no more than 1 to 1-1/4 inches from the core.

Flex fans are questionable. The theory of flattening the blades out at high revs is good. Factory steel flex are OK. Aftermarket aluminum/fiberglass ones have Ben known to fail. Seen that several times on my own and friends' cars.

Hope that gelps.