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1968 - 1982 Corvette Specification Guide
(1968-1982 Engine Block Casting Numbers)

1968 Engine Block Casting Numbers

Casting # Cubic Inches Description/Application
3914660 327 300 Horsepower (early, unverified)
3914678 327 300 & 350 Horsepower
3916321 427 390, 400, 430 & 435 Horsepower (early)
3935439 427 390, 400, 430 & 435 Horsepower (late)

1969 Engine Block Casting Numbers

Casting # Cubic Inches Description/Application
3932386 350 300 & 350 Horsepower (early)
3932388 350 (unverified)
3956618 350 300 & 350 Horsepower (mid)
3970010 350 300 & 350 Horsepower (late)
3935439 427 390, 400, 430 & 435 Horsepower (early)
3955270 427 390, 400, 430 & 435 Horsepower (early)
3963512 427 390, 400, 430 & 435 Horsepower (late)
3946052 427 430 Horsepower ZL1 (aluminum)

1970-1971 Engine Block Casting Numbers

Casting # Cubic Inches Description/Application
3970010 350 300, 350 & 370 (1970); 270 & 330 (1971) HP
3963512 454 390 (1970); 365 & 425 (1971) Horsepower

1972 Engine Block Casting Numbers

Casting # Cubic Inches Description/Application
3970010 350 200 & 255 Horsepower
3970014* 350 200 & 255 Horsepower
3999289 454 270 Horsepower

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

1973-1974 Engine Block Casting Numbers

Casting # Cubic Inches Description/Application
3970010 350 190 (1973); 195 (1974) & 250 Horsepower
3970014 350 A few very early 1973 engines
3999289 454 270 Horsepower

1975-1977 Engine Block Casting Numbers

Casting # Cubic Inches Description/Application
3970010

350

350

 165 & 205 Horsepower (1975)

 180 & 210 Horsepower (1976-77)

1978 Engine Block Casting Numbers

Casting # Cubic Inches Description/Application
3970010 350 175, 185 & 220 Horsepower
376450 350 Usage application uncertain
460703 350 Usage application uncertain

1979 Engine Block Casting Numbers

Casting # Cubic Inches Description/Application
3970010 350 195 & 225 Horsepower
14016379 350 Late

1980 Engine Block Casting Numbers

Casting # Cubic Inches Description/Application
3970010 350 190 & 230 Horsepower
14010207 350 190 & 230 Horsepower
4715111 305 180 Horsepower California

1981-1982 Engine Block Casting Numbers

Casting # Cubic Inches Description/Application
14010207 350 190 (1981) & 200 (1982) Horsepower

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


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