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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 to the beginning of the shift an another dot outside the circle indicates what time of day the cast part was made. 

Casting Date
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

 

GMCPauls Truck Parts
Fax-(773)-442-0103

505 Adams Drive / Rockville, IN / 47872
Email- robbinspd1199@yahoo.com