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Old 05-29-2008, 05:05 PM
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Big Block Camaro Fan ?

Need to tap into someone's expertise.I have a 1968 Camaro Big Block I am in the process of restoring.I removed a 7-blade fan/clutch.Looking on EBAY I came across an original BB fan.It is a 4-blade.Not sure what is original or what whould cool better.Also saw a 4-blade w/spacer,stated original.
Should I stay w/7-blade and clutch or 4-blade w/spacer or 4-blade w/clutch?

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Old 05-29-2008, 05:12 PM
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That's interesting. I wonder why GM would have used less blades in that application? My first impression would be that the pitch is different. If you lay a fan blade flat down and measure from the surface it's laying on up to the edge of the blade, that's the pitch figure. I've always used an OEM steel fan of one sort or another through the years and have found pitches from 1 1/2" to 2 3/4" (Olds diesel).
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Old 05-29-2008, 07:25 PM
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with 4 blades, it will likely have more pitch than a 7 blade fan, and it will make more noise. a 7 blade fan could use less pitch to move the same CFM of air with less noise, theoreticly less drag on the engine also but that amount would be negligable.
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