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I have one of each. They're different.

How do you figure that's the same pump as the Milodon pump? They look completely different.

How were you able to keep both pieces of that pulley concentric when you welded them back together?

I painted the aluminum radiator in my 68 Dart. There was zero difference in running temp and I didn't use "radiator paint." Any good paint will work - just don't lay it on thick. Common sense is key.

I'm assuming based on his first post that he's already tested it. Otherwise, how would he know it has stopped working?

You say it stopped working?? Why would anyone re-install a part that wasn't working? Toss it and buy another one - they're cheap.

I must be extraordinarily lucky. I've never had a problem getting a factory thermostat housing to seal. Those billet ones do look pretty slick though.

Are you sure that's an a/c water pump pulley? It looks to be the standard non-a/c 70-up pulley. The a/c pulley is shallower, has a smaller OD, and runs off the front groove of the crank pulley if I recall. Your setup should work fine though. If anything, you may want to add a good shroud to it...

Put a stock mechanical fan on it. That flex fan is junk.

I realize it's too late now, but I'd have tried a stock fixed fan long before tossing an aftermarket flex fan on it. Didn't you say it's overheating when moving anyway? If that's the case, airflow may not be the (only) issue. Maybe there was some junk in the water jackets in the block that were...

What fan did you try? Was it a factory fixed fan (if so, which one - 5 blade, 7- blade, etc? What diameter?), or was it an aftermarket POS? How far from the radiator was it? Did it have a shroud? If it's overheating when it's moving, it's probably not an air flow issue anyway.

Heck, I'd try taking that mess of a shroud and fans off all together and toss a solid mechanical fan on that water pump with no shroud and give it a shot. At least air would be able to pass through the complete surface of the radiator when the car's in motion.

Does anyone make a set of single v-groove pulleys that overdrive the water pump 10-15%?

It's likely a dual pass radiator like 92b said above. The OP made it sound like he bought it new, so he can verify. If it's not a dual pass, that'd be an awfully bad f-up for a 'new' radiator.

#2947 Low Profile Fan Clutch

Are your sure about that? I thought the A/C cars generally had 6 blade pumps, but were over driven to increase coolant flow (and fan speed).

Thanks. I was looking at that diagram earlier today. Unfortunately, it's slightly different with a single 2-speed fan like I've got. I'll figure it out eventually. Thanks again.

Hey, did you by chance wire in an override switch to power the fan(s) manually instead of through the controller. I'm trying to wrap my mind around how that would be done using the Dakota fan controller. Seems like it would require a 5-pin relay upstream of the switched power for the controller...

I wonder if any of this is helping the OP. I'm guessing not.

If nothing else, this thread shows that there's obviously more than one way to skin a cat when it comes to cooling systems.

It might just be the angle, but that crank pulley is tiny. I'd be curious what your w/p pulley ratio is. Most people want at least a 1:1, or close to it.

Do you have any cooling issues with that pulley set-up?

I've always wondered - are electric fans all rated the same way (like a static air flow at a specific voltage measured at a specific distance from the fan)? Or do the manufacturers decide the parameters that they rate their fans under? I've always felt like you kind of have to take advertised...

Not quite. Out of curiosity, I looked it up. It seems to vary depending on the year. Here's what the '66 Dodge FSM says: '68 Plymouth FSM: '69 Dodge FSM: '73 Dodge FSM:

Do you happen to have a good part number for the cast iron housings you get from Napa?

Great point. Another good alternative is to contact them prior to ordering. Sucks you have to do that, but that's what I did and they assured me the correct one would be shipped - and it was.

Those are about half that price on ebay. Chrysler Mechanical Water Pump, High Volume Aluminum 318 340 360 - CVF Racing | eBay

The small block Milodon high flow water pump has 8 vanes, right? Not 6?

There are people on this board parting out all kinds of cars. I would bet one of them would have it.

Well, I guess it's a good thing I don't make it a habit of bouncing my cars off of curbs. I never knew that was even a thing.