Reference: Chevy Engine Block Casting Numbers

By Bobby Kimbrough September 19, 2013The Chevrolet small-block engine is a series of automobile V8 engines built by the Chevrolet Division of General Motors using the same basic, and for a V8, smaller engine block. These blocks are referred to as the “Gen I” small-block, the subsequent “Gen II” LT, and “Generation III/IV” LS, along with the current “Generation V” (LT/EcoTec3) engines.

The Chevrolet big-block is a series of large displacement V8 engines that were developed and used in the 1950s through the 1970s. Chevrolet had introduced its popular small-block V8 in 1955, but needed something larger to power the medium-duty trucks and its heavier cars that were on the drawing board.

Gen I small-block Chevy engine. This drawing is of the 1967 version of the 302 cid Chevrolet. Drawings by David Kimble.Production of the original small-block began in the fall of 1954, for the 1955 model year, with a displacement of 265 cid, growing incrementally over time until reaching 400 cid in 1970. Several intermediate displacements appeared over the years, such as the 283 cid that was available with mechanical fuel injection, the 327 cid as well as the numerous 350 cid versions.

Although all of Chevrolet’s siblings of the period (Buick, Cadillac, Oldsmobile, and Pontiac) designed their own V8s, it was the Chevrolet 350 cu in (5.7 L) small-block that became the GM corporate standard. Over the years, every American General Motors division, except Saturn, used it and its descendants in their vehicles.
In all, over 90,000,000 small-blocks have been built in carbureted and fuel injected forms since 1955. The small-block family line was honored as one of the 10 Best Engines of the 20th Century by the automotive magazine Ward’s AutoWorld.

Here is a list of casting numbers, along with their original applications.

Generation I Small-Block

10036033 Small Block V8 350, 4-bolt, Goodwrench crate engine, 2-piece rear seal

10051182 Small Block V8 2 bolt, Bow Tie block, 3.75-4.30 bore, 1-piece rear seal

10051184 Small Block V8 4 bolt, Bow Tie, 4.00-4.160 bore, 1-piece rear seal

10054727 Small Block V8 1986 350, 2-bolt or 4-bolt, one piece rear seal

10066036 Small Block V8 350, 4-bolt, Goodwrench crate engine, 2-piece rear seal

10066038 Small Block V8 1994 350, 4-bolt, Goodwrench crate engine, 2-piece rear seal

10090511 Small Block V8 1990 350, 2-bolt, LT5, Corvette ZR1, 375hp

10134996 Small Block V8 4-bolt, Bow Tie, aluminum, 4.125 bore, 2.65 main journals

10199001 Small Block V8 1993-1995 350, 4-bolt, LT5, Corvette ZR1, 405hp

10243878 Small Block V8 1996-1997 305, 2-bolt, Vortec truck, roller cam, 1-piece rear seal

10243880 Small Block V8 1995-1999 350, 4 bolt, crate engines and ZZ4, roller cam, one piece rear seal

Chevrolet Block Identification number locations. Photo from www.justanswer.com

140029 Small Block V8 1980-1984 350, 2 bolt

14010201 Small Block V8 1980-1984 305, 2 bolt

14010202 Small Block V8 1980-1984 305, 2 bolt

14010203 Small Block V8 1980-1985 305, 2 bolt

14010207 Small Block V8 1980-1985 350, 2 bolt or 4 bolt

14010209 Small Block V8 1980-1985 350, 4 bolt

14010280 Small Block V8 1979-1982 267, 2 bolt

14011064 Small Block V8 1983 350, 4 bolt

14011148 Small Block V8 1987-1989 350, roller cam, 1-piece rear seal

14016376 Small Block V8 1979-1982 267, 2 bolt

14016379 Small Block V8 1977-1979 350, 2 bolt or 4 bolt

14016381 Small Block V8 1980-1984 305, 2 bolt

14016382 Small Block V8 1979-1984 305, 2 bolt

14079287 Small Block V8 1986-1990 350, Truck

14088526 Small Block V8 1987-1989 350, roller cam, 1-piece rear seal

14088548 Small Block V8 1986-1988 350, 2 bolt or 4 bolt

14088551 Small Block V8 1986-1987 305, 2 bolt, 1-piece rear main seal

14093627 Small Block V8 1987-1991 305, 2 bolt, roller cam, 1-piece rear seal

14093638 Small Block V8 1987-1995 350, 2 bolt or 4 bolt, roller or flat tappet cam, 1-piece rear seal

14101148 Small Block V8 1987-1990 350, 4 bolt, 1-piece rear seal

14102058 Small Block V8 1987-1991 305, 2 bolt, roller cam, 1-piece rear seal

330817 Small Block V8 1972-1980 400, 2 bolt

3556519 Small Block V8 1958-1961 283, 2 bolt

355909 Small Block V8 1975 262, 2 bolt

355909 Small Block V8 1976-1979 305, 2 bolt

360851 Small Block V8 1975-1976 262, 2 bolt

361979 Small Block V8 1978-1979 305, 2 bolt

366245 Small Block V8 1978-1979 350, 2 bolt

3703524 Small Block V8 1955 265, 2 bolt, no oil filter

3720991 Small Block V8 1956-1957 265, 2 bolt

3731548 Small Block V8 1957 265, 2 bolt, no side engine mounts

3731548 Small Block V8 1957 283, 2 bolt, no side mounts

3737739 Small Block V8 1958-1964 283, 2 bolt

3756519 Small Block V8 1958-1962 283, 2 bolt

3782870 Small Block V8 1962-1967 327, 2 bolt

3789817 Small Block V8 1962-1964 283, 2 bolt

3789817 Blocks Small Block V8 1962-1967 327, 2 bolt

3789935 Small Block V8 1961-1964 283, 2 bolt

3790721 Small Block V8 1962-1964 283, 2 bolt, recessed oil filter boss

3790721 Small Block V8 1965-1966 327, 2 bolt, recessed oil filter boss

3791362 Small Block V8 1962-1967 327, 2 bolt, recessed oil filter boss

3792563 Small Block V8 1965 327, 2 bolt

3792582 Small Block V8 1964-1965 283, 2 bolt

3794226 Small Block V8 1958-1963 283, 2 bolt

3794460 Small Block V8 1962-1964 327, 2 bolt

3814660 Small Block V8 1968-1969 327, 2 bolt

3830944 Small Block V8 1963 327, 2 bolt

3834810 Small Block V8 1964-1966 283, 2 bolt

3834812 Small Block V8 1962-1963 283, 2 bolt

3837739 Small Block V8 1958-1962 283, 2 bolt

3849852 Small Block V8 1957-1966 283, 2 bolt

3849935 Small Block V8 1965-1967 283, 2 bolt

3858174 Small Block V8 1964-1967 327, 2 bolt

3858180 Small Block V8 1964-1967 327, 2 bolt

3858618 Small Block V8 1968-1976 350, 2 bolt

3862194 Small Block V8 1965-1967 283, 2 bolt, recessed oil filter boss

3862812 Small Block V8 1962-1964 283, 2 bolt

389257 Small Block V8 1967 302, 2 bolt

3892657 Small Block V8 1967 302, 2 bolt, Camaro Z28

3892657 Small Block V8 1967 327, 2 bolt

3892657 Small Block V8 1967 302, 2 bolt, Camaro Z28

3896944 Small Block V8 1967 283, 2 bolt

3896948 Small Block V8 1966-1967 283, 2 bolt

3903352 Small Block V8 1967 327, 2 bolt

3914636 Small Block V8 1968 307, 2 bolt

3914653 Small Block V8 1968-1973 307, 2 bolt

3914660 Small Block V8 1968 327, 2 bolt

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