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what radiator cap do I need 55 v8

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  • what radiator cap do I need 55 v8

    I guess I need one with a relief pressure valve, but what pressure?

  • #2
    6 or 7 psi (unless your radiator has been updated with later 'ribbed' tanks.
    (higher psi caps can cause 'flexing' of the top & bottom tank...but some will differ in their own experience)
    Are you running a 'puke tank'?
    Jeff[8D]


    quote:Originally posted by Wildman

    I guess I need one with a relief pressure valve, but what pressure?


    http://community.webshots.com/user/deepnhock
    HTIH (Hope The Info Helps)

    Jeff


    Get your facts first, and then you can distort them as much as you please. Mark Twain



    Note: SDC# 070190 (and earlier...)

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    • #3
      depends on whether it's an early or late '55. how deep is the filler neck? early = 7 psi, deeper neck. late = 13 psi

      nate

      --
      55 Commander Starlight
      http://members.cox.net/njnagel
      --
      55 Commander Starlight
      http://members.cox.net/njnagel

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      • #4
        I've already responded to the OP by email, but this seems to come up every now and then so I'm throwing this up here for posterity... from Service Bulletin no. 293 (had to dig it out to get my facts straight)

        "Last year we had a closed Circuit, full-time pressure system which maintained pressure until approximately 7 lbs. above normal was reached. This year we use an atmospherically vented type of pressure cooling system with a rating of 12-15 psi above normal atmosphere. The increase in pressure is controlled by the new radiator cap."

        yadda yadda yadda blah blah blah.

        BUT...

        "Commander models will initially use the 7 lb. system used on 1954 Commander models."

        I guess Stude must have had leftover stock of radiators from '54 and had to use them up somehow.

        Also this:

        "The new cap is different in design and size from the one used on 1953-1954 models (1953-1954 models 1" thick, 1955 models 3/4" thick) and therefore cannot be used on prior models -- it will not fit."

        So that's how you tell which radiator cap you need to buy for your '55 Commander (or, really, any 53-55 car for that matter - it's quite possible that since all those radiators are interchangeable, that a '55 rad could have been used in an early car as a replacement part over the years, or vice versa.)

        nate

        --
        55 Commander Starlight
        http://members.cox.net/njnagel
        --
        55 Commander Starlight
        http://members.cox.net/njnagel

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