Take a look at this. This is kinda a progression of fans. It's by far not all of them, but will kinda give you an idea of what went on through the years.
First, there's the basic four blade solid fan. Came on slant sixes and small V8s with no AC.
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Next is this one. These are gettin kinda hard to find. It came on small V8s early on. You'll notice how the the blades on these two first fans are full width all the way to the end, but they lack that turned up edge on the end. That's because Chrysler was still learning about what worked.
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This third one is really gettin hard to find. It's basically the same as what you get with the Mopar Performance Viscous Fan Package, but in solid form. You notice the ends are turned up. They found out that this moves even more air. This is the fan I'm fixin to put on Vixen. It does have a drawback. It's damned heavy. But, since it mounts in the center, that kinda negates "some" of that weight. No DOUBT it'll move a lot more air than the four blade on it now.
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Finally there's this one. It's an early Mopar Performance Viscous Fan Package. I say early, because it's one that uses the bimetal strip, instead of the bimetal spring to control lockup. They didn't work quite as well as the spring units, but they did work. I don't have enough room for it, but If I did, I'd use it and replace the clutch with a Hayden heavy duty unit. Again, you can see how the blades are full width all the way to the end and they turn up on the end. In comparison to your fan,
@MAPS, this fan and the five blade solid staggered fan before it will probably move over twice the air your fan will. If you want to stay solid, this next to last fan is what you want to find. If you want to go clutch fan, I recommend the staggered five blade MP fan. I've argued the point before to be disagreed with, but that five blade staggered design moves more air than any other belt driven fan Chrysler ever made. It's in print, right in the Mopar Perfomance book. Larry Shepard and all those other Chrysler engineers weren't stupid. They knew through trial and error....and sometimes by pure accident what works and what doesn't. In fact, Larry is still kickin and doin well. I talk with him on Facebook from time to time. Anyway, maybe this will help you make an informed decision on a fan. I hope it will anyway.
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