Extra block numbers

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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?

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

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

Greg

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

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Bore……

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

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

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.0001 four places =ten thousandths.

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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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