NGK IZFR6K13 Iridium Spark Plug – Stock No. 6774
The NGK IZFR6K13 is a high-quality iridium spark plug designed for reliable ignition, smooth running, and long service life. It uses a fine-wire iridium centre electrode to deliver a strong, stable spark with less voltage demand. This helps cold starts, idle quality, and throttle response, especially on tuned or hard-driven engines.
Built to OE standards, it suits many modern petrol engines that specify a long-reach 14 mm plug with a 1.3 mm factory gap. Use the vehicle lookup on our site or check the Vehicle Fitment tab to confirm it for your engine.
Why choose this plug
- Fine-wire iridium tip for consistent ignition and durability
- Resistor design to reduce electrical noise that can affect the ECU
- Projected tip for efficient combustion and good drivability
| Part Number | IZFR6K13 |
|---|---|
| NGK Stock Number | 6774 |
| GTIN | 087295167748 |
| Category | 686 – Spark Plug |
| Thread Diameter | 14 mm |
| Thread Reach | 19 mm (3/4 in) |
| Hex Size | 16 mm (5/8 in) |
| Seat Type | Flat seat with gasket |
| Heat Range | 6 (NGK scale) |
| Resistor | Yes |
| Spark Gap | 1.3 mm (factory set) |
| Centre Electrode | Fine-wire iridium |
| Ground Electrode | Tapered, nickel alloy |
| Tip Projection | Projected |
Compatibility guidance
Fits many Honda and Acura petrol engines that specify a 14 mm, long-reach, projected iridium plug with a 1.3 mm gap. Always confirm with the vehicle lookup or the Vehicle Fitment tab.
The price displayed is for a single plug, please add the desired amount to your basket.



