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1953 - 1967 Corvette Specification Guide
(1953-1967 Engine Block Casting Numbers)

1953

Casting # Cubic Inches Description/Application
3701481 235 Six-Cylinder, 150 Horsepower, 1st Design
3835911 235 Six-Cylinder, 150 Horsepower, 2nd Design

Note:   Changeover from 1st to 2nd design occurred between block casting dates "J133" and "J163" (October 13-16, 1953).

 

1954

Casting # Cubic Inches Description/Application
3835911 235 Six-Cylinder, 150 & 155Horsepower

 

1955

Casting # Cubic Inches Description/Application
3835911 235 Six-Cylinder, 155 Horsepower
3703524 265 V-8, 195 Horsepower

 

1956

Casting # Cubic Inches Description/Application
3720991 265 All V-8 Engines

 

1957

Casting # Cubic Inches Description/Application
3731548 283 All V-8 Engines

1958-1961
Casting # Cubic Inches Description/Application
3737739 283 1958 & Early-1959 engines
3756519 283 Mid-to-Late 1958 through Late-1961 Engines
3789935 283 Very Late 1961 Engines

1962-1964

Casting # Cubic Inches Description/Application
3782870 327 All V-8 Engines

1965
Casting # Cubic Inches Description/Application
3782870 327 250, 300, 350, 365 & 375 Horsepower
3858180* 327 Limited Quantity of Units
3855962 396 425 Horsepower

* A limited number of these small block engines appear in 1965 Corvettes.  Their casting origin was Tonawanda, New York;  apparently shipped to the Flint, Michigan, V-8 engine plant for machining and assembly. Their usage is believed to be a substitution occurring during a foundry shutdown at Saginaw, MI.

1966
Casting # Cubic Inches Description/Application
3858174 327 300 & 350 Horsepower
3858180 327 300 & 350 Horsepower (unverified)
3892657 327 300 & 350 Horsepower (possible late)
3855961 427 300 & 350 Horsepower (possible early)
3869942 427 390 & 425 Horsepower

1967
Casting # Cubic Inches Description/Application
3892657 327 300 & 350 Horsepower
3903352 327 300 & 350 Horsepower (late, unverified)
3869942 427 Early Big Block Engines
3904351 427 Majority of  Big Block Engines
3916321 427  Late Big Block Engines

Corvette Engine Block Casting Notes

Six-cylinder casting numbers are located in a recess just below, and forward of, the fuel pump mounting boss, above the crankcase oil pan mounting lip.  Block casting dates are located at the right rear side of the block, next to the starter motor solenoid.

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.  It should be noted that the very limited use 1965 Tonawanda 327 cubic-inch block cast 3858180 has a casting date (ending in the two year digits "65") located adjacent to the block 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 digit, or digits, representing the date of the month ("1" through "31"); followed by a single digit designating the last digit of the calendar year.  Small block (265, 283 and 327 cubic-inch) 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:  "62" for 1962), and these castings were not used in Corvette production except for the 1965 example cited.

Casting Month Code 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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