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NGK 3508 Spark Plug
| Brand | NGK 3508 |
|---|---|
| Resistance | 5000 |
| Ground Electrode Tip Design | Standard |
| Ground Configuration | Standard |
| Ground Electrode Core Material | Nickel |
| Electrical Terminal Type | Non-removable nut |
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Iridium |
| Pre-Gap Size | .032 |
| Ground Electrode Quantity | 1 |
| Hex Size | 5/8 |
| Insulator Height | 50.50 |
| Manufacturer Heat Range | 5 |
| Seat Type | Flat |
| Reach | .75 |
| Thread Diameter | 14.00 |
| Part Number | Ifr5t-8n |
| Stock Number | 3508 |
| Product line | Laser Iridium Spark Plug |
| Fits | Mazda · 2 vehicles |
Laser iridium design. Iridium tip helps deliver precise, consistent ignition performance.
Copper core. Promotes efficient heat transfer for stable operation.
OE standards. Built with original equipment quality and durability in mind.
Cross-references AMS Automotive 4701, Anchor 3303 and Anchor 3435 for the same application. See all 9.
NGK Laser Iridium Spark Plug for Mazda Miata
The NGK Laser Iridium Spark Plug, part number 3508, is built for precise ignition performance in select Mazda Miata applications. It uses an iridium center electrode, nickel ground electrode, and a 0.032 in. pre-gap to support consistent spark delivery and stable combustion.
Compatible with 2004-2005 Mazda Miata, this NGK 3508 spark plug is a direct-fit ignition service part for drivers maintaining OE-style performance and service intervals.
Key Features
- Laser Iridium spark plug from NGK
- Part number 3508 / IFR5T-8N
- Iridium center electrode tip with copper core
- Nickel ground electrode with standard configuration
- 0.032 in. pre-gap
- 14 mm thread diameter, 0.75 in. reach, flat seat
- 5 k? resistance and non-removable nut terminal
- Compatible with 2004-2005 Mazda Miata
Product Details
NGK is a long-established OE spark plug supplier with broad coverage across domestic and import vehicles. The Laser Iridium line focuses on OE-style ignition performance using a fine iridium center electrode for dependable spark consistency and a standard ground electrode layout. For Mazda Miata owners, part number 3508 provides the specified 0.032 in. gap and the correct thread, reach, and seat dimensions for the listed application.
This part cross-references Anchor 3508 for the same application.
Common Replacement Reasons
- Engine misfire or rough idle
- Hard starting or extended crank time
- Reduced fuel economy from worn plugs
- Loss of throttle response under load
- Maintenance replacement at the OE service interval
Installation Notes
Verify the engine is cool before removal and confirm the plug gap matches the vehicle specification before installation. Use the correct 5/8 in. hex socket and tighten to the manufacturer’s torque specification for the Mazda Miata application. Check coil boots, plug wells, and ignition components during service to help prevent repeat misfire concerns.
Quality Assurance
NGK manufactures spark plugs to OE standards and supplies ignition components for a wide range of automotive applications. Part number 3508 is built to match the listed fitment and specification details for 2004-2005 Mazda Miata service.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2005 | Mazda | Miata | 1.8L | L4 | N/A | Gap 0.032"; Actual OE Manufacturer; 100,000 mi OE Mfr Recommended Service Interval; Laser Iridium Spark Plug |
| 2004 | Mazda | Miata | 1.8L | L4 | N/A | Gap 0.032"; Actual OE Manufacturer; 100,000 mi OE Mfr Recommended Service Interval; Laser Iridium Spark Plug |
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