The casting number is usually located on the front or side of the engine block, near the top. It is typically a series of raised numbers and letters.
Step 2: Decode the casting number.
The first digit of the casting number indicates the year the engine was produced. The second and third digits indicate the engine plant code. The fourth and fifth digits indicate the engine displacement in cubic inches. The last digit indicates the engine series.
For example, the casting number 14015237 would indicate that the engine was produced in 1984 (1), at the Flint, Michigan engine plant (40), and that it is a 2.8-liter V6 engine (15).
Here is a table of engine codes for classic Chevy S10s:
| Casting Number | Year | Engine Plant | Displacement | Series |
|---|---|---|---|---|
| 14015237 | 1984 | Flint, MI | 2.8L V6 | 60° |
| 10186191 | 1985 | Flint, MI | 2.5L I4 | 90° |
| 10204343 | 1986 | Flint, MI | 4.3L V6 | 90° |
| 10204402 | 1987 | Flint, MI | 4.3L V6 | 90° |
| 10207016 | 1988 | Flint, MI | 4.3L V6 | 90° |
| 10213314 | 1989 | Flint, MI | 4.3L V6 | 90° |
| 10231352 | 1990 | Flint, MI | 4.3L V6 | 90° |
| 10240273 | 1991 | Flint, MI | 4.3L V6 | 90° |
| 10249117 | 1992 | Flint, MI | 4.3L V6 | 90° |
| 10260403 | 1993 | Flint, MI | 4.3L V6 | 90° |
| 10271689 | 1994 | Flint, MI | 4.3L V6 | 90° |
Note: This table is not exhaustive. There may be other casting numbers that are not listed here.
