Pontiac V8 Displacements
| Year | Displacement | Bore in inches | Stroke in inches | Mains in inches |
|---|---|---|---|---|
| 1955 | 287 | 3.75 | 3.25 | 2.50 |
| 1956 | 317 | 3.9375 | 3.25 | 2.50 |
| 1957 | 347 | 3.9375 | 3.5625 | 2.623 |
| 1958 | 370 | 4.0625 | 3.5625 | 2.623 |
| 1959-'66 | 389 | 4.0625 | 3.75 | 3.00 |
| 1963-'66 | 421 | 4.09375 | 4.00 | 3.25 |
| 1963-'67 | 326 | 3.720 | 3.75 | 3.00 |
| 1967-'69 | 428 | 4.120 | 4.00 | 3.25 |
| 1967-'79 | 400 | 4.120 | 3.75 | 3.00 |
| 1968-'77 | 350 | 3.880 | 3.75 | 3.00 |
| 1970-'76 | 455 | 4.150 | 4.21 | 3.25 |
| 1977-'81 | 301 | 4.00 | 3.00 | 3.00 |