Topic: Proper Radiator Cap Pressure for ‘53 Mercury M-100


rdouglas    -- 03-14-2020 @ 4:28 AM
  Hi,

I own a ‘53 Mercury M-100 (equivalent to Ford F-100) with its original flathead V8 and radiator. While working on the vehicle recently, I noted the radiator cap (which appears to be an after market replacement) is rated for 13 lbs. After doing some research, I believe this is the incorrect pressure and likely too high. Looks like perhaps I should be running either 4 or 7 lbs, based on searching some of the early ford v-8 parts suppliers. Can someone on the forum please confirm the proper spec pressure so I can replace my cap with a correct part? Thank you.


cliftford    -- 03-14-2020 @ 4:14 PM
  I could be wrong, but it sticks in my mind that the fords of this period took a 7# cap.


rdouglas    -- 03-16-2020 @ 11:29 AM
  Thanks for your help


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