Engine Code Location
Engine Code letters on 6-cylinder engines are stamped on distributor mounting pad on right side of engine block. On V8 engines, code letters are located on machined face of engine block, below right hand cylinder head.
| Engine | Code Letters |
|---|---|
| 250" 6-Cyl. 1-Bbl. | CCC, CCD, CCA, CCB |
| 350" V8 2-Bbl. | XR, YZ, YR, Y7, YV XV, ZR, ZV, YL |
| 400" V8 2-Bbl. | YP, Y4, YX, Y1 ZX ZK YZ |
| 400" V8 4-Bbl. | WK, YS, WS, WP, Y3 YN, ZS, YY, ZN, YT |
| 455" V8 4-Bbl. | WW, YC, YA, WT ZC, ZA, YK, YD |
| 455" V8 4-Bbl. (Super Duty) | W8, Y8 |