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  1. Robertop

    Hemi block stamp 2

    Guys, recently I posted about a stamp on my Hemi engine bottom pad and mentioned the letters "RM" and unfortunately I was wrong. The pad actually starts with "MN" instead. The question is the same, i.e., what do they mean?
  3. Robertop

    Hemi block stamp

    Guys: my Hemi engine, 69 roadrunner, has a stamp on the bottom pad that starts with "RM 426, etc, etc,". Does anyone know what the letters "RM " mean? Thank you.
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