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The most general spark plug for the A12 engine is NGK BP5ES. However, depending on the year, market and usage, Nissan recommended the colder BP6E. For severe use, BP4ES, 5, 6 or 7 can be used. If you are unsure which to use, use BP5ES or BP6ES.
For gap, Nissan specifies 0.031 inch. I recommend 0.035 for a smoother idle. The larger gap was used in the early B210 with the same plugs and same ignition system.
| Spark Plug Type | 1971 | NGK BP6E |
| 1972-1976 | NGK BP5ES | |
| 1977-1978 US models - except 5-speed trans | NGK BP5ES-11 (standard)
NGK BP4ES-11 (hot) | |
| 1977-1978 US models - 5-speed transmission | NGK BP5EQ-11 (standard)
NGK BP4EQ-11 (hot) | |
| 1977-1978 Canadian models | NGK BPR5ES (standard)
NGK BPR4ES (hot) | |
| Spark Plug Gap | 1200 | 0.028-0.032 in. (0.7-0.8 mm) |
| 1974-1976 B210 | 0.031-0.035 in. (0.8-0.9 mm) | |
| 1977 B210 - US models | 0.039-0.043 in. (1.0-1.1 mm) | |
| 1977 B210 - Canadian models | 0.031-0.035 in. (0.8-0.9 mm) | |
| 1978 B210 - non-California 5-speed | 0.043-0.051 in. (1.1-1.3 mm) | |
| 1978 B210 - other US models | 0.039-0.043 in. (1.0-1.1 mm) | |
| 1978 B210 - Canadian models | 0.031-0.035 in. (0.8-0.9 mm) |