NGK BR7EF Spark Plug (3346)
Original price was: £7.96.£3.74Current price is: £3.74.
NGK BR7EF Spark Plug – Stock No. 3346
The NGK BR7EF is a reliable, colder heat range spark plug for performance and tuned petrol engines. It uses a resistor to reduce electrical noise and a durable nickel alloy electrode for consistent ignition. The heat range 7 runs cooler than standard road plugs, helping reduce knock under high load.
It is a good choice for turbo or high-compression setups that regularly see higher cylinder temperatures. Expect smoother combustion, better throttle response, and stable spark at increased boost. For stock, lightly tuned, or daily use, benefits will be modest.
Use the vehicle lookup to confirm fitment, or check the Vehicle Fitment tab for details. This plug suits engines that specify a 14 mm thread, 19 mm reach, gasket seat, and NGK heat range 7.
Technical specifications
| Part number | BR7EF |
| NGK stock number | 3346 |
| GTIN | 087295133460 |
| Category | 686 – Spark Plug |
| Thread diameter | 14 mm |
| Reach (thread length) | 19 mm |
| Seat type | Gasket |
| Hex size | 20.8 mm |
| Heat range | 7 (colder than OEM 5-6 on NGK scale) |
| Resistor | Yes |
| Centre electrode | Nickel alloy |
| Ground electrode | Nickel, standard cut |
| Tip style | Standard (non-iridium, non-platinum) |
| Factory gap | Approx. 0.8 mm (adjust to engine spec) |
| Emission suitability | Road and track use |
- Colder plug for tuned engines – helps control heat and reduce detonation.
- Consistent spark under boost thanks to resistor design and robust electrodes.
- Built to NGK standards for reliability and long service life.
Setup guidance
Gap the plug to your engine’s specification. Turbo engines often run 0.7-0.8 mm to avoid spark blowout at high boost. Apply a new crush washer and torque correctly:
– Aluminium head: 25-30 Nm
– Cast iron head: 39-43 Nm
Re-check after initial heat cycles. Do not overtighten. Always follow the vehicle manufacturer’s spec.
The price displayed is for a single plug, please add the desired amount to your basket.
| Weight | 0.05 kg |
|---|---|
| Dimensions | 10 × 3 × 3 cm |
| Brand |
NGK-3346 Confirmed Fitment
Please note, this information is a combination of supplier provided compatibility data and our workshop expertise. While every effort has been made to ensure the accuracy of this information Progressive Parts Ltd are not liable for abnormalities or inaccurate data. Customers are wholly responsible for checking fitment for their vehicle. More information is available from our Terms & Conditions
UK Shipping
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DELIVERY INFORMATION
International Shipping
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DELIVERY INFORMATION
Returns
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Stock at Progressive Parts
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OUT OF STOCK in red. This product is unavailable to order, for whatever reason we're unable to obtain stock or there is an issue with supply/lead times.
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Products on the Progressive Parts website that meet this approval will be clearly marked or labelled EC or ECE approved.