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Old Jun 4, 2004 | 05:15 PM
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ford390gashog's Avatar
ford390gashog
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Talking rad cap

what is the right pressure rating for the rad cap on my 75 ford f 150 with a 390 in it and would the wrong cap make it overheat
 
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Old Jun 4, 2004 | 08:54 PM
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GasHog, the radiator cap spec isn't listed in any of my books, but I'm sure it's in the 12-14 lb range.

It's doubtful that a difference of a couple pounds would make any difference in whether it overheats or not (with a 50/50 coolant mix). It's more likely that the radiator is clogged up a bit, or the radiator shroud is ill-fitting or missing. Another possibility is an old thermostat that's not opening completely......
 
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