1955 Ford radiator cap

[Sid]

Does anyone know the maximum pressure cap to run on a 55 Fairlane radiator? Auto parts house books say 13 lbs but that seems too high. I was thinking they didn't go to 13 lbs until about mid 60's. I was thinking between 4-7 lbs. for a 55 or 56 Fairlane.

[willowbilly3]

C&G Ford parts lists a 14#. I run a 13 on my Y block and everything seems koposetic.

[Ole Don]

I used a 13 pound new style cap with an overflow tank. It worked fine.

[dmsfrr]

The parts book I use for my '55 says 13 lbs, and also has another 'replacement' at 7 lbs.
The increased pressure raises the boiling point slightly and helps if the engine runs toward the hot side, a bit less likely to boil over. If the cooling system could be in better shape a lower cap pressure can postpone some leaks.

.

[bobss396]

If the radiator looks decent, go with the 13. I have a 16 pound cap on my new Champion radiator.

[Ford Freak]

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I ran a #13 on my '57 312 w/ an overflow tank . Worked great !

[RCM]

13 on the Champion (new).