1975 ( Grand National Engine ) details

Small Block Mopar Engine

  1. 1Badcolt

    1Badcolt Well-Known Member

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    Amazing such modest components got the job done !
    This info from a 1975
    Direct Connection publication
    ( L.S Shepard )
    Chrysler Motors Corporation
    Detroit , Michigan

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    • autoxcuda

      autoxcuda Well-Known Member

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      They might seem off the shelf. But it seems there was some very select and special parts that went to top teams (Petty).

      i have flow bench charts from “Petty castings”.

      And memos of “select” parts being sent/from to Petty and special drag teams.
       
    • 1Badcolt

      1Badcolt Well-Known Member

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      Like all prominent figures u are right Im sure they had the best stuff first # just like all those Super Stock guys in GA had in early 60s at
      Nalley Chevrolet etc !!
      Items listed are kinda spartan Those worked TA heads are unique to say the least cool old article indeed.
       
    • autoxcuda

      autoxcuda Well-Known Member

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      race T/A castings are even different than street casting. More square looking ports.

      by ‘75 they were up to W-3 or further heads.

      I’ll look for some sheets…
       
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      • 1Badcolt

        1Badcolt Well-Known Member

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        Yes please do some of us find that old stuff very interesting and will always be worth reading about.
         
      • 1Badcolt

        1Badcolt Well-Known Member

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        In this same book contains many statements about ( W1 ) hardware !
         
      • mbaird

        mbaird mbaird

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        Is this the early book with yellow cover ?
         
      • 1Badcolt

        1Badcolt Well-Known Member

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        White as pictured
        1975 date
        One year before W2 release
        I have alot of Direct Connection parts books but this is rarely seen or Has been during my searching.
         
      • 1Badcolt

        1Badcolt Well-Known Member

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        Just stapled together like 35 pages
        Bought off of ebay last year
        I havent seen anymore of this particular one but 100 members could have it for all I know.
         
      • 1Badcolt

        1Badcolt Well-Known Member

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        Maybe these are something u mentioned very unique versus conventional LA castings

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        • autoxcuda

          autoxcuda Well-Known Member

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          Last edited: Jul 21, 2021
        • autoxcuda

          autoxcuda Well-Known Member

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          Here’s reference to square port W-2’s. From other paperwork they were having foundry issues with them and that might have killed them being available to public. Not sure if any survived to actually race.

          I cant find my other reference to W-2-1/2 and W-3. Not sure if this “square port W-2” is also called a W-2 1/2.

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        • autoxcuda

          autoxcuda Well-Known Member

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          Here’s 1978 testing with “D-casting” exhaust ports. …Standard W-2 configuration, I’d say

          And another head with square intake and teardrop exhaust; “special casting”

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          DRE77823 looks like this: Looking for information on a set of W2 heads
           
        • autoxcuda

          autoxcuda Well-Known Member

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          there’s a whole bunch of stapled “Bulletins” they sold. Then they compiled them into the Racing Manuals books.

          The blue 1978 one has 867 pages with 41 bulletins. The yellow 1979 one has 873 pages with 43 bulletins. So even though the yellow book is thinner it has more pages. must be thinner paper.

          Also, it seems the individual bulletins got updated and edited. My loose leaf Big Block bulletin has a 1973 copyright and the books have 1976.

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          • 1Badcolt

            1Badcolt Well-Known Member

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            Thank u
             
          • 1Badcolt

            1Badcolt Well-Known Member

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            Very good info , thank u very much
            Good to see people preserved those archives
             
          • 1Badcolt

            1Badcolt Well-Known Member

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            Thats some great info wish u was selling copies of it all ### that is coffee table worthy indeed.
             
          • 1Badcolt

            1Badcolt Well-Known Member

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            I wonder if that fiberglass intake still exists ?
            Camshaft info interesting also small lift but motor probably made north of 600 Hp u agree ?
            Thanks Chris
             
          • 1Badcolt

            1Badcolt Well-Known Member

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            Nice collection
             
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            • autoxcuda

              autoxcuda Well-Known Member

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              ill check if the second page notes anything.
               
            • 1Badcolt

              1Badcolt Well-Known Member

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              10-4
               
            • pishta

              pishta I know I'm right....

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            • SSG_Karg

              SSG_Karg Heeeeeres Johnny!

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            • 1Badcolt

              1Badcolt Well-Known Member

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              Those are before my time , what was main benefit of those versus reg solid lifters ???
               
            • pishta

              pishta I know I'm right....

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              you can get a more aggressive cam lobe when the face of the lifter is like 1.00, but a roller will still put it to shame. Must be put in with block upside down on a stand from the bottom!
               
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