The Engine Block Casting code is one of the best ways to identify a Chevy engine block. This engine Casting number is usually found at the rear of the block on the left or drivers side on top of the bellhousing flange.
Chevy Big Block Engine Block Codes (ALL)
| Casting | Years | CID | Main | Comment |
| 10051107 | 454 | 4 | Mark IV, Bowtie, 9.8 deck, siamesed bores, 4.25-4.50 bore | |
| 10069282 | 1990-1991 | 366 | 4 | Mark IV, Tall deck |
| 10069284 | 427 | 4 | Mark IV, Tall deck | |
| 10069286 | 1990-1991 | 454 | 4 | Mark IV, Short deck |
| 10114182 | 1991-up | 454 | 4 | Generation V |
| 10114183 | 1991-up | 366 | 4 | tall deck, Generation V |
| 10114184 | 1991-up | 427 | 4 | tall deck, Generation V |
| 10134366 | 454 | 4 | Bowtie, Generation V, Tall deck | |
| 10185050 | 454 | 4 | Bowtie, Generation V, Short deck | |
| 10237297 | 1996-up | 454 | 4 | Vortec 7400, L-29 Generation VI |
| 10237299 | 1996-up | 427 | 4 | tall deck, Generation VI, 7.0L, truck |
| 10237300 | 1996-up | 502 | 4 | Generation VI, 4.466 bore |
| 12550312 | 1996-up | 427 | 4 | Generation VI, 4.250 bore, fuel pump boss, clutch linkage pivot boss, tall deck |
| 12550313 | 1991-up | 454 | 4 | Generation V crate motor, Generation VI 4.25 bare block, fuel pump boss |
| 12556110 | 2001-up | 496 | 4 | Generation VII 8.1L, Vortec 8100, Truck |
| 12561357 | 1996-up | 454 | 4 | Generation VI |
| 12561358 | 502 | 4 | Generation VI | |
| 1401544 | 1975-87 | 454 | 2/4 | truck useage casting number may also be 14015445 |
| 14015443 | 1987-1990 | 454 | 2/4 | Mark IV, Truck or Motorhome |
| 14015445 | 1978-1990 | 454 | 2/4 | |
| 14044807 | 454 | 4 | Bowtie, Mark IV, CNC prep, Tall deck, 4.25 bore or 4.495 bores | |
| 14096859 | 502 | 4 | Generation V, HO | |
| 24502504 | 454 | 4 | Bowtie, Generation V, Race prep, 9.8 short deck height | |
| 24502506 | 454 | 4 | Bowtie, Generation V, Race prep, 10.2 tall deck height | |
| 25534402 | 4 | 4.590 bore Olds DRCE 3, 9.25 deck height. For competition in 500 CID NHRA Pro Stock Drag Racing | ||
| 326711 | 4 | aluminum, CanAm, 4.44 bores, steel cylinder liners | ||
| 340220 | 1972-76 | 427 | tall truck | |
| 345014 | 1974-86 | 454 | truck | |
| 346236 | 1974-76 | 454 | 2 | Chevelle, Monte Carlo |
| 359070 | 1974-90 | 454 | truck | |
| 361959 | 1973-85 | 454 | car & truck | |
| 364776 | 1968-84 | 427 | tall truck | |
| 364779 | 1968-88 | 366 | tall truck | |
| 3755011 | 1959-61 | 348 | 2 | 250, 280, 305, 320, 335 |
| 3771705 | 1959-61 | 348 | 2 | 250, 280, 305, 320, 340, 350, 2-bolt |
| 3782870 | 1968-76 | 427 | tall truck | |
| 3788068 | 1962-63? | 409 | 2 | 340, 380, 400, 409, 425, 2-bolt |
| 3795623 | 1961 | 409 | 2 | 360, 2-bolt Impala SS |
| 3798962 | 1961 | 348 | 2 | 250, 280, 305, 340, 350, 2-bolt |
| 3824553 | 1966-1967 | 366 | 4 | |
| 3830814 | 1963-64 | 409/427 | 2 | 340, 400, 425, 427ci-430hp, 2-bolt |
| 3844422 | 1963?-64 | 409 | 2 | 340, 400, 425, 2-bolt |
| 3855061 | 1966-67 | 396 | ||
| 3855961 | 1966-67 | 396 | 2 | passenger, chevelle |
| 3855962 | 1965-66 | 396 | 4 | passenger, Chevelle, Z16, Corvette |
| 3855977 | 1965-67 | 366 | tall truck | |
| 3857656 | 1965 | 409 | 2 | 340, 400, 2-bolt |
| 3866961 | 1966-69 | 396 | Chevy, Chevy truck | |
| 3869942 | 1966-67 | 427 | 2/4 | corvette, passenger |
| 3873858 | 1966 | 396 | 4 | |
| 3902406 | 1967 | 396 | 2/4 | Camaro, Chevelle |
| 3902466 | 1965-67 | 396 | ||
| 3904351 | 1967 | 427 | 2/4 | 385, 390, 400, 425, 430, 435, corvette |
| 3904354 | 1966-67 | 366 | tall truck | |
| 3916319 | 1968-85 | 366 | tall truck | |
| 3916321 | 1968 | 427 | 2/4 | 385, 390, 400, 425, 430, 435, corvette |
| 3916323 | 1968 | 396 | 2/4 | camaro, chevy II, chevelle |
| 3918319 | 1966-70 | 366 | Chevy truck, GMC, tall truck | |
| 3925521 | 1968-85 | 366 | tall truck | |
| 3928319 | 1969-73 | 366 | GMC, tall truck | |
| 3935439 | 1968-69 | 427 | 2/4 | 335, 390, 400, 425, 430, 435, Corvette |
| 3935440 | 1968-69 | 396 | 2/4 | Chevelle, Camaro, Nova |
| 3937724 | 1968-85 | 366 | tall truck | |
| 3937726 | 1968-84 | 427 | tall truck | |
| 3946052 | 1969 | 427 | 4 | ZL-1, aluminum, Camaro, Corvette |
| 3946053 | 1997-up | 427 | 4 | aluminum ZL-1, 2nd version, Mark IV |
| 3955270 | 1969 | 427 | 2/4 | 335, 390, 400, 425, 430, 435 Corvette, passenger |
| 3955272 | 1969 | 396/402 | 2/4 | Camaro, Chevelle, Chevy II, passenger |
| 3955274 | 1968-85 | 366 | tall truck | |
| 3955276 | 1968-84 | 427 | tall truck | |
| 3963512 | 1969-71 | 427 | 2/4 | 335, 390, 400, 425 COPO, 430, 435, Camaro, Corvette |
| 3963512 | 1970-72 | 454 | 2/4 | 345, 360, 365, 390, 425, 450, Chevelle, Corvette, Monte Carlo |
| 3963513 | 1973-76 | 454 | ||
| 3965440 | 1968-69 | 396 | ||
| 3965449 | 1968-72 | 396 | ||
| 3965540 | 1968 | 396 | ||
| 3969852 | 1968-1984 | 366 | 4 | |
| 3969854 | 1969-72 | 396/402 | 2/4 | 240, 265, 300, 325, 330, 350, 375, Camaro, Chevelle, Chevy II |
| 3969854 | 1969-73 | 454 | 2/4 | |
| 3969858 | 1968-84 | 427 | tall truck | |
| 399204 | 1970-1971 | 509 | 4 | aluminum, CanAm, 4.5 bores, steel Cylinder liners |
| 399293 | 1977-1978 | 366 | 4 | |
| 3999289 | 1972-78 | 454 | 2 | Chevelle, Corvette, Monte Carlo, truck |
| 3999290 | 1972 | 402 | 2 | Chevelle, Camaro |
| 3999293 | 1968-85 | 366 | tall truck | |
| 3999294 | 1968-84 | 427 | tall truck | |
| 473478 | 1968-84 | 427 | tall truck | |
| 495102 | 4 | aluminum, CanAm, 4.5 bores | ||
| 6272176 | 1968-76 | 366 | Chevy, GMC, tall truck | |
| 6272177 | 1972 | 402 | ||
| 6272181 | 1973-76 | 427 | tall truck |