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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 to the beginning of the shift an another dot outside the circle indicates
what time of day the cast part was made.
Small block casting date is located on driver
side rear of block on flange forward of bellhousing. Big block on the right side
of engine above the oil pan rails.
Casting Date Example: A087 - ( = Month, 08 = Day, 7= Last
digit of model year (1967)).
Month: A = Jan, B = Feb, C = Mar, D = Apr, E = May, F = Jun, G =
July, H = Aug, I = Sep,
J = Oct, K = Nov, L = Dec