| Clue | Source | Date |
|---|---|---|
| Car engine's 4, 6 or 8: Abbr. | ||
| Engine spec | The Chronicle of Higher Education | 16 Jan 2015 |
| Engine spec. | ||
| Engine specification: Abbr. | ||
| Autos' 4, 6, or 8, for short | ||
| Engine pts. | ||
| V-8's eight: Abbr. | ||
| There are eight in a V-8 (abbr.) | ||
| Automobile parts: Abbr. |