Spark Plugs
The standard Windsor uses a plug with the following specs:
The NGK AP5FS fits the bill here.
Many aftermarket heads use a 0.750" reach plug such as the NGK FR5.
Check with your head manufacturer for the required specs.
Heat range cross reference table.
| Reach | Hex Size | NGK Heat Range | Thread Diameter |
|---|---|---|---|
| 0.460" | 20.8mm (13/16") | 5 | 18mm |
The NGK AP5FS fits the bill here.
Many aftermarket heads use a 0.750" reach plug such as the NGK FR5.
Check with your head manufacturer for the required specs.
Heat range cross reference table.
| HEAT RANGE | COLD | ...... | ...... | ...... | ...... | HOT |
|---|---|---|---|---|---|---|
| BRISK | 8 | 10 | 12 | 14 | 15 | 17 |
| NGK | 10 | 9 | 8 | 7 | 6 | 5 |
| DENSO | 31 | 27 | 24 | 22 | 20 | 16 |
| BOSCH | 2, 07 | 3, 08 | 4 | 5 | 6, 7 | 8 |
| CHAMPION | 55, 57 | 4, 59 | 6, 61, 63 | 7, 8 | 9, 10 | 11, 12 |