Reading Piston Tops

BigSky
BigSky Senior Contributor
in HUDSON
Anyone know what the readings on this piston may mean?  




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  • BigSky
    BigSky Senior Contributor
    I think I found some answers....

  • Ric West IN
    Ric West IN Senior Contributor
    D is the code for piston diameter. 10/3 is the weight in oz. or 10 and 3/4 oz.
    Pistons are numbered as to which cylinder the piston was originally installed.  The 3 digit number should match the 1st 3 digits of the motor number . Making sure the pistons were installed in the correct block.  This info from my 1942-1947 shop manual.
  • Hudson_in_Seattle
    Hudson_in_Seattle Member
    obviously, someone fed a whole bunch of old movable type into the intake - glad they shot out the exhaust . . . and hopefully someone has the real answer!

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