Production Code Number
First two letters in production code number identify engine displacement, carburetion, and compression ratio. Production code number is located on left side of block below front two spark plugs (350"); left side of block below rear two spark plugs (400", 430" & 455").
| 1968 Engine | Compression Ratio | Code Letters | ||
|---|---|---|---|---|
| 350" 2-Bbl. | 9.0-1 | PO | ||
| Export | 7.6-1 | PW | ||
| 4-Bbl. | 10.25-1 | PP | ||
| 400" 4-Bbl. | 10.25-1 | PR | ||
| 430" 4-Bbl. | 10.25-1 | PD | ||
| Export | 8.75-1 | PE | ||
| 1969 Engine | Compression Ratio | Code Letters | ||
|---|---|---|---|---|
| 350" 2-Bbl. | 9.0-1 | RO | ||
| Export | 8.0-1 | RW | ||
| 350" 4-Bbl. | 10.25-1 | RP | ||
| 400" 4-Bbl. | 10.25-1 | RR, RS | ||
| 430" 4-Bbl. | 10.25-1 | RD | ||
| Export | 8.75-1 | RE | ||
| 1970 Engine | Compression Ratio | Code Letters | |
|---|---|---|---|
| 350" 2-Bbl. | 9.0-1 | SO | |
| 4-Bbl. | 9.0-1 | SB | |
| 4-Bbl. | 10.25-1 | SP | |
| 455" 4-Bbl. | 10.0-1 | SR | |
| 4-Bbl. | 10.0-1 | SF | |
| 4-Bbl. Stage 1 | 10.5-1 | SS | |
| 1971 Engine | Compression Ratio | Code Letters | |
|---|---|---|---|
| 350" 2-Bbl. | 8.5-1 | TC | |
| 2-Bbl. | 8.5-1 | TO | |
| 4-Bbl. | 8.5-1 | TB | |
| 4-Bbl. | .8.5-1 | TP | |
| 455" 4-Bbl. | 8.5-1 | TR | |
| 4-Bbl. | 8.5-1 | TA | |
| 4-Bbl. Stage 1 | .8.5-1 | TS | |
| 1972 Engine | Compression Ratio | Code Letters | |
|---|---|---|---|
| 350" 2-Bbl. | 8.5-1 | WC | |
| 4-Bbl. | 8.5-1 | WB | |
| 455" 4-Bbl. | 8.5-1 | WF | |
| 4-Bbl. | 8.5-1 | WA | |
| 4-Bbl. Stage 1 | 8.5-1 | WS | |
| 1973 Engine | Compression Ratio | Code Letters | |
|---|---|---|---|
| 350" 2-Bbl. | 8.5-1 | XC | |
| 4-Bbl. | 8.5-1 | XB | |
| 455" 4-Bbl. | 8.5-1 | XF | |
| 4-Bbl. Century Stg. 1 | 8.5-1 | XS | |
| 4-Bbl. Riviera Stg. 1 | .8.5-1 | XA | |