Quote:
Originally Posted by Formulas
The large numbers are intended model year fitment the 4 digit codes are the actual day the molten metal was poured into the mold
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The OP's block has a 1976 casting date with a large 75 being previous year. The block in post 38 also has a 1976 casting date with a large 75 being previous year. Attached is another one. I thought the general rule is casting dates are not after model year is finished.
Also the crank in the B046 dated block had a 2 1/2" register.