The engine block casting number for both BBC and SBC engines is found at the back of the block where the transmission mounts to the engine. Photo from http://www.chevyasylum.com

The Chevrolet engine blocks represented below are from the series of V-8 automobile engines built by the Chevrolet Division of General Motors. They are divided into the Big-Block and Small-Block series with the Big Block “W” series and Small Block “LS” series as independent categories.

The Chevrolet Small-Block  engine is a series of automobile V-8 engines built by the Chevrolet Division of General Motors using the same basic, and for a V-8, 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 V-8 engines that were developed and used in the 1950s through the 1970s. Chevrolet had introduced its popular small block V-8 in 1955, but needed something larger to power the medium duty trucks and its heavier cars that were on the drawing board.

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 V-8s, 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.

Gen I Small-Block Chevy engine. This drawing is of the 1967 version of the 302 cid Chevrolet. Drawings by David Kimble.

Generation I Small Block

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

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

10051184 Small Block V8 4 bolt, Bowtie, 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, Bowtie, 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

3914678 Small Block V8 1968 302, 2 bolt, Camaro Z28

3914678 Small Block V8 1968 327, 2 bolt

3914678 Small Block V8 1968 350, 2 bolt

3932371 Small Block V8 1969-1973 307, 2 bolt

3932373 Small Block V8 1968-1973 307, 2 bolt

3932386 Small Block V8 1969 302, 4 bolt, Camaro Z28

3932386 Small Block V8 1969 327, 2 bolt

3932386 Small Block V8 1969 350, 4 bolt

3932388 Small Block V8 1969 350, 2 bolt or 4 bolt

393288 Small Block V8 1965-1967 283, 2 bolt

3951509 Small Block V8 1970-1971 400, 4 bolt

3951509 Small Block V8 1974-1980 400, 2 bolt

3951511 Small Block V8 1970-1972 400, 2 bolt or 4 bolt

3956618 Small Block V8 1969 302, 4 bolt, Camaro Z28

3956618 Small Block V8 1968-1969 327, 2 bolt

3956618 Small Block V8 1969 350, 2 bolt or 4 bolt

3956632 Small Block V8 1969 307, 2 bolt

3959512 Small Block V8 1962-1963 327, 2 bolt

3970010 Small Block V8 1969 302, 4 bolt, Camaro Z28

 

Drawing of an LS6 Small-Block Chevrolet engine.

LS Small Block 

12550592 LS Small Block V8 1997-up 346, LS1

12559846 LS Small Block V8 1998-up 346, LS1

12560621 LS Small Block V8 1998-up 346, LS1

12562174 LS Small Block V8 1998-up 346, LS1

LT Small Block

10125327 LT Small Block V8 1992 350, 2 bolt or 4 bolt, LT1, reverse flow cooling

10125327 LT Small Block V8 1996 350, 2 bolt or 4 bolt, LT4, reverse flow cooling

10153558 LT Small Block V8 1991-1992 350, 4 bolt, LT5, Corvette ZR1, 375hp

W Block

3732755 W Block 1959-1961 348 CID

3732811 W Block 1958 348 CID

3751872 W Block 1958 348 CID

3755011 W Block 1959-1961 348 CID

3771705 W Block 1959-1961 348 CID

3782012 W Block 1958-1961 348 CID

3788068 W Block 1962-1963 409 CID

3795623 W Block 1961 409 CID

3798962 W Block 1962-1965 348 CID, Truck

3815707 W Block 1958-1961 348 CID

3830814 W Block 1963 427 CID, Z11, 4.312 inch bore, 3.65 inch stroke

3830814 W Block 1963-1964 409 CID

3839752 W Block 1962-1963 409 CID

3839754 W Block 1965 409 CID

3844422 W Block 1963-1965 409 CID

3857655 W Block 1962-1965 348 CID, Truck

3857656 W Block 1964-1965 409 CID

3860386 W Block 1962-1964 409 CID

3860387 W Block 1958 348 CID

3844422 W Block 1963-1965 409 CID

3857655 W Block 1962-1965 348 CID, Truck

3857656 W Block 1964-1965 409 CID

3860386 W Block 1962-1964 409 CID

3860387 W Block 1958 348 CID

Big Block Chevrolet

10051107 Big Block V8 454, 4 bolt, Bowtie, MkIV, 9.8 deck, siamesed bores, 4.25-4.50 bore

10069282 Big Block V8 1990-1991 366 tall deck, 4 bolt, Mark IV, Tall deck

10069284 Big Block V8 427 tall deck, 4 bolt, Mark IV, Tall deck

10069286 Big Block V8 1990-1991 454, 4 bolt, Mark IV, Short deck

10114182 Big Block V8 1991+ 454, 4 bolt, Generation V

10114183 Big Block V8 1991+ 366 tall deck, 4 bolt, Generation V

10114184 Big Block V8 1991+ 427 tall deck, 4 bolt, Generation V

10134366 Big Block V8 454 tall deck, 4 bolt, Bowtie, Generation V, Tall deck

10185050 Big Block V8 454, 4 bolt, Bowtie, Generation V, Short deck

10237297 Big Block V8 1996+ 454, 4 bolt, Vortec 7400, L-29 Generation VI

10237299 Big Block V8 1996+ 427 tall deck, 4 bolt, Generation VI, 7.0L, truck

10237300 Big Block V8 1996+ 502, 4 bolt, Generation VI, 4.466 bore

12550312 Big Block V8 1996+ 427 tall deck, 4 bolt, Generation VI, 4.250 bore, fuel pump boss, clutch linkage pivot boss

12550313 Big Block V8 1991+ 454, 4 bolt, Generation V crate motor, Generation VI 4.25 bare block, fuel pump boss

12556110 Big Block V8 2001+ 496, 4 bolt, Generation VII 8.1L, Vortec 8100, Truck

12561357 Big Block V8 1996+ 454, 4 bolt, Generation VI

12561358 Big Block V8 502, 4 bolt, Generation VI

14015443 Big Block V8 1987-1990 454, 2 or 4 bolt, Mark IV, Truck or Motorhome

14015445 Big Block V8 1978-1990 454, 2 bolt or 4 bolt

14044807 Big Block V8 454 tall deck, 4 bolt, Bowtie, MkIV, CNC prep, Tall deck, 4.25 bore or 4.495 bores

14096859 Big Block V8 502, 4 bolt, Generation V, HO

24502504 Big Block V8 454, 4 bolt, Bowtie, Generation V, Race prep, 9.8 short deck height

24502506 Big Block V8 454 tall deck, 4 bolt, Bowtie, Generation V, Race prep, 10.2 tall deck height

24502572 Big Block V8 4 bolt, 4.5 bore Olds DRCE 2, 9.5 deck height

25534402 Big Block V8 4 bolt, 4.590 bore Olds DRCE 3, 9.25 deck height

326711 Big Block V8 4 bolt, aluminum, CanAm, 4.44 bores, steel cylinder liners

340220 Big Block V8 1968-1985 427 tall deck, 4 bolt

345014 Big Block V8 1970-1986 454,

346236 Big Block V8 1975-1976 454, 2 bolt

359070 Big Block V8 1970-1990 454,

361959 Big Block V8 1973-1990 454, 2 bolt or 4 bolt

364776 Big Block V8 1968-1985 427 tall deck, 4 bolt

364779  Big Block V8 1968-1990 366 tall deck, 4 bolt

3782870 Big Block V8 1968-1976 427 tall deck, 4 bolt

3824553 Big Block V8 1966-1967 366 tall deck, 4 bolt

3855961 Big Block V8 1965-1966 396, 2 bolt or 4 bolt

3855961 Big Block V8 1966 427, 2 bolt

3855962 Big Block V8 1965-1966 396, 4 bolt

3855977 Big Block V8 1966-1973 366 tall deck, 4 bolt

3869942 Big Block V8 1966-1967 427, 2 bolt or 4 bolt

3902406 Big Block V8 1967 396, 2 bolt or 4 bolt

3904351 Big Block V8 1967 427, 2 bolt or 4 bolt

3904354 Big Block V8 1966-1976 366 tall deck, 4 bolt

3916319 Big Block V8 1968 366 tall deck, 4 bolt

3916321 Big Block V8 1968 427, 2 bolt or 4 bolt

3916323 Big Block V8 1968 396, 2 bolt or 4 bolt

3925521 Big Block V8 1968-1985 427 tall deck, 4 bolt

3935439 Big Block V8 1968-1969 427, 2 bolt or 4 bolt

3935440 Big Block V8 1968-1969 396, 2 bolt or 4 bolt

3937724 Big Block V8 1968-1985 366 tall deck, 4 bolt

3937726 Big Block V8 1968-1984 427 tall deck, 4 bolt

3946052 Big Block V8 1969 427, 4 bolt, aluminum ZL-1, Mark IV

3946053 Big Block V8 1997+ 427, 4 bolt, aluminum ZL-1, 2nd version, Mark IV

3955270 Big Block V8 1969 427, 2 bolt or 4 bolt

3955272 Big Block V8 1969 396, 2 bolt or 4 bolt

3955274 Big Block V8 1968-1985 366 tall deck, 4 bolt

3955276 Big Block V8 1968-1973 427 tall deck, 4 bolt

3963512 Big Block V8 1969 427, 2 bolt or 4 bolt

3963512 Big Block V8 1970-1976 454, 2 bolt or 4 bolt

3969852 Big Block V8 1968-1984 366 tall deck, 4 bolt

3969854 Big Block V8 1969 396, 2 bolt or 4 bolt

3969854 Big Block V8 1970-1972 402, 2 bolt or 4 bolt

3969858 Big Block V8 1968-1984 427 tall deck, 4 bolt

399204 Big Block V8 1970-1971 509, 4 bolt, aluminum, CanAm, 4.5 bores, steel Cylinder liners

399293 Big Block V8 1977-1978 366 tall deck, 4 bolt

3999289 Big Block V8 1971-1979 454, 2 bolt or 4 bolt, some CE replacement blocks had four bolt main caps

3999290 Big Block V8 1968-1969 396, 2 bolt or 4 bolt, Truck

3999290 Big Block V8 1970-1972 402, 2 bolt or 4 bolt, Truck

3999290 Big Block V8 1972 402, 2 bolt or 4 bolt, Passenger

3999293 Big Block V8 1968-1990 366 tall deck, 4 bolt

3999294 Big Block V8 1968-1984 427 tall deck, 4 bolt

473478 Big Block V8 1977-1990 427 tall deck, 4 bolt

495102 Big Block V8 4 bolt, aluminum, CanAm, 4.5 bores