* Block appears on some later production 1972 350's.

Corvette Engine Block Casting Notes

All V-8 engine block (both small block and big block) casting numbers are located on the top left surface of the flange formed at the rear of the block for engine flywheel attachment.  V-8 casting dates are located on the right-hand side of the block, opposite the casting number.

The St. Louis Corvette assembly plant was supplied small block V-8 engines from the Flint engine plant; big block engines were supplied by the Tonawanda facility.

Engine block casting date codes begin with the letter "A" for January, "B" for February and so on (the letter "I" representing the month of September was used) through "L" for December (see month chart) followed by a digit, or digits, representing the date of month ("1" through "31") followed by a single digit designating the last digit of the calendar year.  Small block engines were cast at the Chevrolet foundry in Saginaw, Michigan, and shipped to Flint for machining and assembly. Saginaw cast small block V-8 engines can normally be distinguished by use of a single digit calendar year code; Tonawanda cast small block V-8 engines normally use the last two digits (example:  "68" for 1968), and these castings were not used in Corvette production.

Casting Month Codes Chart

                   A - January               E - May            I - September

                       B - February             F - June            J- October

                       C - March                   G - July            K - November

                       D - April                     H- August        L - December