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Old Mar 24, 2007 | 08:54 AM
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new radiator?

will the stock radiator from a 66 F100 that had a 300 I6 in it be enough to support the 400? it will be replaced eventualy but i'm trying to decide what is absoloutly neccesarry before getting the engine running.
 
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Old Mar 24, 2007 | 01:06 PM
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I wouldn't trust it. Your adding two more cylinders of the same size, and a decent amount of heat.

Flex-a-lite has some new raditators that are slick, or becool makes some really nice models if your looking at doing an aftermarket.
 
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Old Mar 24, 2007 | 02:34 PM
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On the north shore of Alaska maybe but not down here in the 48. Check the different radiator sizes listed for the 300 and 400 engines. You need a larger radiator.
 
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Old Mar 24, 2007 | 04:18 PM
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ok thats kinda what i was thinking. i guess it was just wishful thinking about keeping the old one
 
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Old Mar 24, 2007 | 04:30 PM
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outlets don't match up anyway. Ford had a supercooling rad. for the 300 (camper specials?) but they're pretty rare.
 
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Old Mar 24, 2007 | 04:50 PM
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hmmm...what about a stock style radiator for a 66 with a 352 or a 390 FE engine?
 
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Old Mar 24, 2007 | 05:16 PM
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did you put the 400 into a '66?
 
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Old Mar 24, 2007 | 05:19 PM
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yes the 400 is in the machine shop right now but i am trying to get the truck ready for it. the truck did have a 300 I6 in it.
 
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