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International Automotive Technicians Network
Re: Decoding Clock Style Casting Numbers
Posted to Technical Discussion Forum on 1/12/2010

Here Eric. I got this off this site.

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Casting Clock

On some Saginaw blocks, intakes and exhausts a "clock" was cast into the block. The clock is a circle of 10 dots, one dot for each hour of a shift (usually 10 hour shifts). An arrow points ... Login to read more.