Engine Code Number
Located on tag attached to right valve cover. Some engines will have two sets of numbers on tag, engine numbers will be designated by the CODE LETTERS USED ON CHART only. Other letters refer to special bearings etc.
| Code | Displ. & Carb. | Compr. Ratio | Bore |
|---|---|---|---|
| H | 290" 2 Bbl. | 9.0:1 | 3.75" |
| N | 290" 4 Bbl. | 10.0:1 | 4.00" |
| S | 343" 2 Bbl. | 9.0:1 | 4.08" |
| Z | 343" 4 Bbl. | 10.2:1 | 4.08" |
| W | 390" 4 Bbl. | 10.2:1 | 4.165" |