Technical Radiator Cap Pressure

I have a 1964 c10 with a 292, what is the cap pressure supposed to be for the factory radiator? My dad thinks it's supposed to be a 7lb system, but everything I have found says 13lbs. Can anyone help me out? Help greatly appreciated and thanks in advance!


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Are any of the parts rotten that may blow apart when too much pressure is applied? Raising the pressure raises the boiling point. Go with 7lbs if you are worried, 13 if things are in good shape. My suggestion.

 

Under 10 for an older radiator. Looked at a thread on here just this AM. Like 7 to 9.

 

The higher the pressure the higher the boiling point I use a 15# cap.

 

Yeah, but you need a radiator that'll take the pressure.

 

And a heater core to match that pressure. Many forget about the heater. Try 7# to see if it may be fine then maybe work up.

 

I've always use a 7# Stant #11328 Lever release cap and a 160 thermostat on my old cars. No problem!

 

So I looked again today and my radiator is leaking just a little bit. I have been using a 13# cap but not sealed all the way. I ordered a new radiator should come in tomorrow or the next day. Should I use whatever cap it comes with? I forgot to ask what pressure it was.


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I've never bought a new one that came with a cap.

 

It didn't come with one, it has plastic tanks, is the #13 cap I currently have ok? Or should I get a lower pressure one when I swap the radiator?

 

Dude, use the #13 cap.

 

I put in the new radiator, and set the 13# cap. I drove back from my uncles and the truck was barely blowing hot air, and the temp gauge was reading real low. It's like 12 miles of 2,900rpms it should be warm right? I checked everything and all looks good, motor wasn't too hot or anything, it was just fine. Does this sound ok? Or am I being paranoid?


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What thermostat is in it?

 

Shaking my head......

 

Haha.

I am not for sure what was put in it, I wanna say a 180 or 185? Maybe The Bald One remembers


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