I have a 59 Ford Custom 300. It has a 262 from a truck in it. I bought it that way. I keep cracking the upper tank on the radiator about every 15+ months or so. (2 different radiators) I can't find any info on radiator cap psi for a 262. Everything says a 13 psi cap for a 223 in a 1959 Ford car. But if you look up a radiator cap for a 1962 Ford F-100 with a 223 it calls for a 7 psi cap. Ive always ran the 13 psi cap. Why would technically the same motor call for 2 different PSI ratings between a truck and a car? Since I basically have a truck motor in mine, should I be running the lower Psi cap? Thank you,
Not sure if it helps, but I just had my original ‘55 223 (Customline) radiator re-cored and my radiator guy said the same thing - use the lower PSI cap. I don't think it has as much to do with the application as it does with the fact that getting the pans for these old radiators is difficult.
as rich said 2 different rads.the increase in rating raises the amount of temperature before releasing pressure. I would use the #7 to be safe.if in doubt google is a good source
Thank you for the replies. I didn't even think about radiator size can increase/decrease the pressure. I was thinking motor generates the pressure, but it makes sense now. I will run the 7 psi and see how that goes. Appreciate it.
Here is a little chart i found showing where the boiling pint vs radiator pressure. Also the al***ude variation. I couldnt get it to upload.. Heres the url http://www.4btengines.com/wp-content/uploads/2017/05/Cooling-System-Al***ude-Pressure-Chart.jpg
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