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decode my block please

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  • decode my block please

    Hi All,

    I had some resurfacing work done on the head of my 50 Champion last week and put everything together Friday. While the head was off I noticed that the block has "05" stamped near the left edge between each of the pistons. I'm sure this must tell me something if I knew enough to read it but I can only make guesses. Can anyone set me straight?

    Thanks,

    Gerry

  • #2
    I had a block that was stamped.06, it was bored .06 over in the cylinders.

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    • #3
      Thanks!

      I kinda suspected that but also wondered if it might have to do with the block being resurfaced.

      Gerry

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      • #4
        .060 is a standard oversize. .050 is not. In fact, I have never seen .050 oversize pistons. I doubt if the block has been bored .050.

        I heard somewhere that Studebaker fitted individual pistons to the bores much the same as Porsche does. The stamp by each bore may indicate the over/under size for that individual cylinder. In that case, the number is probably more like .005.

        -Dick-
        Dick Steinkamp
        Bellingham, WA

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        • #5
          This is mentioned in most all Studebaker shop manuals. It denotes the final finished size of each cylinder bore. '05' means that the actual cylinder size is 3.0005", or 5/10,000 of an inch, which is half of .001". The engine assemblers would know to select a piston compatible to that size in order to achieve the proper fit, which was measured with a special feeler gauge and a spring scale.
          And after a few thousand miles of operation, those numbers don't mean a thing anymore! <G>

          Dwain G.

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          • #6
            Yup, page 124 of my shop manual, plain as day had I only looked. I'm a bit embarrassed over not looking there first [V] but definately appreciate the guidance Dwain.

            Thanks!

            Gerry

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