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1961 - 1966 F-100 & Larger F-Series Trucks Discuss the Slick Sixties Ford Truck

Crossflow or downflow radiator.

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Old May 20, 2020 | 08:31 PM
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Crossflow or downflow radiator.

1966 F100, 2wd, 240, 3ot

Does it matter which radiator is used???
 
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Old May 21, 2020 | 02:41 AM
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It should do fine with the factory radiator, as long as it’s in good shape. My 65 with a 302 has the stock 352 down flow radiator. No issues at all.
 
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Old May 21, 2020 | 04:28 AM
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Either will work fine. I owned a radiator shop for 20 years and never figured out why they switched from down flow to cross flow. They both performed well, but the down flow was easier to fill, and easier to check circulation. The important thing is clean tubes and solid fins, doesn't seem to matter which way it flows.
 
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Old May 21, 2020 | 09:00 AM
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The switch from downflow to crossflow was to get a wider, lower profile, radiator. This was a result of the lower hood heights that started being produced.
The old, top to bottom flow was originally designed for thermosiphon systems, where there is no water pump.
Personally, I like traditional, top and bottom tank radiators.
 
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Old May 21, 2020 | 10:44 PM
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Crossflow rads are more efficient but unless you are building a race truck stick with the factory down flow then no mods are needed to install it.
 
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