| Answer | Crossword Clue |
|---|---|
| AUTOPARTS | Spark plugs and air filters |
| AUTOPARTS | Air filters and spark plugs |
| flathead | (of an engine) Having the valves and spark plugs in the cylinder block rather than the cylinder head, which is essentially a flat plate |
| flatheads | (of an engine) Having the valves and spark plugs in the cylinder block rather than the cylinder head, which is essentially a flat plate |
