7 blade fan

[Longroof79]

Both

I got the Monte SS fan from a member parting out an SS. The Hayden flex fan I bought years ago. They probably don't sell them anymore.
Why not look into installing a set of electric fans? That's what I was going to do before I decided to stick to simple old school mechanical fan.

 

[black_aerocoupe]

I am curious as to why it has to be 7 blades when clearly there are other options with less blades.

A 7 blade fan has more force on the air than a 5 blade.
At idle? The 7 blade will move the air better than a 5.
For daily driving with AC here, a 7 works great. A 5 in traffic falls short.
The 4.3 blazer reverse fan works for a serpentine swap SBC.

 

[565bbchevy]

A 7 blade fan has more force on the air than a 5 blade.
At idle? The 7 blade will move the air better than a 5.
For daily driving with AC here, a 7 works great. A 5 in traffic falls short.
The 4.3 blazer reverse fan works for a serpentine swap SBC.

My comment was because the OP was looking at both a flex fan and a clutch fan only because they both had 7 blades.

 

[pontiacgp]

A 7 blade fan has more force on the air than a 5 blade.
At idle? The 7 blade will move the air better than a 5.
For daily driving with AC here, a 7 works great. A 5 in traffic falls short.
The 4.3 blazer reverse fan works for a serpentine swap SBC.

there is alot more to fans than just the number of blades, the pitch and length of blades can make a 5 blade out pull a 7 blade.

 

[paul.m]

Clutch fans have long been said to rob the least amount of HP . I watched a episode of engine masters last year that confirmed this with a dyno . The flex fan was the worst and the clutch the best about a 13 HP difference i believe .

 

[gnvair]

I run the fan and clutch off an 89 9C1 Caprice. It works well was super cheap. A good fan clutch does not rob power if it is working properly.