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M50 Head casting numbers

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    M50 Head casting numbers

    I bought two M50's to use for OBD I parts for an S52. I just took the heads off both M50's ones out of a 94 325i and the other 95 325is. The head casting number on my S52 is 1 738 400. The M50 out of the 95 325is also has the same casting number 1 738 400. I know the heads are the same on all US M5X/S5X, And the difference is the cams and valve springs. But the early head from the 94 325i has a casting number of 1 738 070. The head looks the same as the 400 casting. Anyone ran into this and are the head's interchangeable?

    Thanks

    #2
    Make sure all the coolant holes are the same. That might be the difference.

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      #3
      Sorry I can't answer your question, but can you list the m50 and s52 Block casing numbers here for reference?

      thanks!
      Mtech1 v8 build thread - https://www.r3vlimited.com/board/sho...d.php?t=413205



      OEM v8 manual chip or dme - https://www.r3vlimited.com/board/sho....php?p=4938827

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