Extra block numbers

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  • #392843

    I am in the process of hand cleaning my block before putting it back together.

    While cleaning the intake/exhaust surface I found another stamped number on the forward face of the gasket surface. It is different from the block number on the other side.

    Any clues as to it’s significance?

    #411425

    It is 3.49675. Guess it is the bore???

    #411427

    I would say you are correct. If not split it up and play it in this week’s lottery.

    Greg

    #411433

    My ’29 engine had bore sizes stamped near each cylinder. They were all within a few 10 thousandths of each other. Talk about detail!

    #411434

    Bore……

    #411437

    Tolerances are a little sloppy, only 5 places. Try measuring that.

    #411441

    I agree, that fifth digit is a pain to measure, especially when the temperature is not held constant…

    #411449

    .0001 four places =ten thousandths.

    #411453

    On mine, the last digit was either a 0 or a 5. Must have been a guess. As Mark said, temperature will affect that kind of accuracy, and I am sure they didn’t keep all the engines in a temperature controlled environment. Maybe they wanted to impress the mechanics that maintained the engines across the world.

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