HP manifolds

General Discussion

  1. jwtdvm

    jwtdvm Well-Known Member

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    Is their any difference between a 1967 HP manifold and the more common 68-69????
     
  2. gdrill

    gdrill Just enjoying "B"-ing here FBBO Gold Member

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    Value, to some. The 67 440 HP manifold casting is one year only.
     
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    • 440 4 speed

      440 4 speed Well-Known Member

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      I was told that there was a difference in the positioning of the holes of one of the manifold flanges. Haven’t compared, and don’t know for sure.
       
    • jwtdvm

      jwtdvm Well-Known Member

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      Is it 1 year only because of casting dates? or is it of different design??
       
    • gdrill

      gdrill Just enjoying "B"-ing here FBBO Gold Member

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      Casting number is unique as far as I know.

      Some one who is actually smart will come along soon and correct me I'm sure! :)
       
    • gdrill

      gdrill Just enjoying "B"-ing here FBBO Gold Member

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    • Jerry Hall

      Jerry Hall FBBO Gold Member FBBO Gold Member

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      Right hand manifold in 67 is the same as 68-69. The left hand manifold is a different casting than the 68-69. 383 & 440 heads are the same so there can be no difference in holes. The difference is in the fasteners used on the LH manifold. I'm not sure about the outlet angle on the LH manifold, but when Don of. Don's mufflers was alive, I had to specify 67 GTX and original manifolds when he made H pipes for me.
       
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      • w.Hudson

        w.Hudson Well-Known Member

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        On the 67 left hand side manifold the outlet angle is different than one for a 68-69. So the H pipe will be different.

        The 67 left side manifold is a one year only HP manifold and when it is on the car, the casting number is upside down. Makes it easy
        to identify.

        I would not think that one would have a performance advantage over the other.
         
        Last edited: Nov 23, 2020
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        • 3white74

          3white74 FBBO Gold Member FBBO Gold Member

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          I have 67 pair......and 68/69 for sale here on the forum if that interests you
           
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