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Which type of 4V heads are this ?
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hassi01



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    Post: #1
    Which type of 4V heads are this ?

    Hello,

    My 4V Cleveland was an original 2V version. It has been modified by another owner. As I mentioned in a view days before I plan to stoke the block to 393 or 408 cui.
    Due to the compression rate I have to know the type of my 4V heads because there are 4 differed versions and I don`t know what`s on my engine (but I know there are no BOSS heads)

    • Standard 4V (61-64cc)
    • Cobra Jet (74-77cc)
    • High Output (74-77cc)
    • Boss (64-67cc)

    My question is how can I check the type of my 4V heads without dismounting them?


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    Offline 12-29-2010 01:34 PM
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    Tnfastbk



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      Post: #2
      RE: Which type of 4V heads are this ?

      (12-29-2010 01:34 PM)hassi01 Wrote:  Hello,

      My 4V Cleveland was an original 2V version. It has been modified by another owner. As I mentioned in a view days before I plan to stoke the block to 393 or 408 cui.
      Due to the compression rate I have to know the type of my 4V heads because there are 4 differed versions and I don`t know what`s on my engine (but I know there are no BOSS heads)

      • Standard 4V (61-64cc)
      • Cobra Jet (74-77cc)
      • High Output (74-77cc)
      • Boss (64-67cc)

      My question is how can I check the type of my 4V heads without dismounting them?


      If you can find the casting number on them:

      http://home.comcast.net/~jelerath/mustan...ds-fr.html
      http://mustangtek.com/heads/Heads.html
      Offline 12-29-2010 01:58 PM
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      Hemikiller



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        Post: #3
        RE: Which type of 4V heads are this ?

        Those are either the standard "M" code 70-71 closed chamber heads or the CJ open chambers due to the bolt down style rockers. The HO and Boss heads had adjustable rockers with studs and guideplates.

        IIRC, the little dot next to the 4 may denote the type of chamber. I 'll have to look at my CC heads again.
        Offline 12-29-2010 02:56 PM
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        Tnfastbk



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          Post: #4
          RE: Which type of 4V heads are this ?

          (12-29-2010 02:56 PM)Hemikiller Wrote:  Those are either the standard "M" code 70-71 closed chamber heads or the CJ open chambers due to the bolt down style rockers. The HO and Boss heads had adjustable rockers with studs and guideplates.

          IIRC, the little dot next to the 4 may denote the type of chamber. I 'll have to look at my CC heads again.

          HK from my understanding and all that I can find on the dot beside the 4 that means you've got early 72 4v or earlier heads...ford retooled for the gas crunch after about february 72 and the dot dissappeared so odds are they are closed chamber heads.
          Offline 12-29-2010 03:10 PM
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          jorgem2



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            Post: #5
            RE: Which type of 4V heads are this ?

            Here is information overload on the heads.
            Dot or no Dot

            http://351cleveland.wetpaint.com/page/4V...preadsheet
            Offline 12-29-2010 03:17 PM
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            david020278



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              Post: #6
              RE: Which type of 4V heads are this ?

              Hi Christian,
              the casting number that you are looking for is on the under side of the heads (this is stupid). Look for the casting date code near the rocker arms. Dot or no dot dont give you a answer. You must bolt down the heads to be sure.


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              (This post was last modified: 12-29-2010 04:01 PM by david020278.)
              Offline 12-29-2010 03:43 PM
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              coilwire



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                Post: #7
                RE: Which type of 4V heads are this ?

                I haver 2 sets of 4v heads, 4v quench heads #0h27
                4v open heads 1m23.
                They are stamped in the rocker valley As soon as I can find my book I will try and get all the numbers.Hope this helps.
                Jim
                Offline 12-29-2010 03:58 PM
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                david020278



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                  Post: #8
                  RE: Which type of 4V heads are this ?

                  The stamped on the rocker valey are the date code.
                  0h27 = 1970 aug. 27
                  1m23 = 1971 oct. 23
                  When the date code 1970 and earlyer you have closed chamber heads after 70 OC or CC heads...

                  (12-29-2010 03:58 PM)coilwire Wrote:  I haver 2 sets of 4v heads, 4v quench heads #0h27
                  4v open heads 1m23.
                  They are stamped in the rocker valley As soon as I can find my book I will try and get all the numbers.Hope this helps.
                  Jim
                  Offline 12-29-2010 04:07 PM
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                  coilwire



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                    Post: #9
                    RE: Which type of 4V heads are this ?

                    shooting from the hip there. Have to clean this shop and find my ford engine books.Blush
                    Jim
                    Offline 12-29-2010 04:46 PM
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                    cobra3073


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                      Post: #10
                      RE: Which type of 4V heads are this ?

                      Christian,

                      All of the above response are "right on" but I am not sure that the "answer" to your question is obvious.

                      I like to identify the 351C heads as being one of two types - - Closed (Quench) Chamber or Open Chamber. There are some differences in combustion chamber volumes within those types which would go to the "heart" of your need for an answer as to which heads you have. My interpretation is that you need that information to figure compression ratio. When considering compression ratio, it is important to appreciate there is not that much difference between the chamber volumes [b]within[/b] a given type (Quench or Open).

                      Other than observing the combustion chamber, the best way to identify the specific type is by casting number. As David stated in an earlier post (where he provided an excellent picture), the casting number is found on the underside of the head (when mounted on the block). In David's picture, it shows a casting number of "D1ZE" on one end of the head and "DA" on the other side which equates to a casting number of D1ZE-DA. This identifies the head as an Open Chamber Cobra Jet head as identified in the links in the other post. The link will also give you the chamber volume for that particular casting number.

                      Again, all of the responses are correct and very good information but just want to make sure that your SPECIFIC question is answered to include (my belief) information germane to why you are asking the question.

                      Hope this helps.

                      BT
                      Offline 12-29-2010 05:04 PM
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