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NGK 4218 Spark Plug
| Brand | NGK 4218 |
|---|---|
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Iridium |
| Electrical Terminal Type | Removable Nut |
| Ground Configuration | Standard |
| Ground Electrode Core Material | Nickel |
| Ground Electrode Quantity | 1 |
| Ground Electrode Tip Design | Taper Cut |
| Hex Size | 5/8 |
| Insulator Height | 50.50 |
| Manufacturer Heat Range | 8 |
| Part Number | CR8EIX |
| Pre-Gap Size | .032 |
| Reach | .75 |
| Resistance | 5000 |
| Seat Type | Flat |
| Stock Number | 4218 |
| Thread Diameter | 10.00 |
| Product line | Iridium IX Spark Plug |
| Fits | Aprilia, Yamaha, Arctic Cat, Can-Am, Kawasaki, Sea-Doo, Hyosung, KYMCO, Suzuki, Triumph, Piaggio, Gas Gas, E-TON, TM, KTM, VOR, Husaberg, and Ferrari · 3 vehicles |
Iridium tip. Promotes strong spark performance and long service life.
Copper core. Helps conduct heat efficiently for stable operation.
OE legacy. Built by NGK, a long-time original equipment supplier.
Cross-references AMS Automotive 4218, Atlantic Automotive Engineering 4189 and DENSO Auto Parts 5362 for the same application. See all 18.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
NGK Iridium IX CR8EIX Spark Plug
NGK CR8EIX 4218 is an Iridium IX spark plug built for precise ignition performance and OE-style fitment. It uses an iridium center electrode, a nickel ground electrode, and a 0.032 in pre-gap to support consistent spark delivery in demanding engine conditions.
Compatible with 1994-1996 Ferrari F355 Berlinetta applications, this NGK spark plug is a direct replacement choice for owners maintaining factory-style ignition performance. The CR8EIX part number 4218 is also referenced by cross-number listings for the same application.
Key Features
- Iridium center electrode tip for stable spark characteristics
- Copper core center electrode for efficient heat transfer
- Nickel ground electrode with taper cut tip design
- Standard ground configuration with one ground electrode
- 5,000 ohm resistance for ignition system compatibility
- Flat seat design with 10.00 mm thread diameter and 0.75 in reach
- Removable nut terminal for common ignition wire and coil setups
- Manufacturer heat range 8 and factory pre-gap of 0.032 in
Product Details
NGK’s Iridium IX line focuses on durable electrode construction and OE-level manufacturing standards. For the Ferrari F355 Berlinetta, part number 4218 provides a spark plug specification that aligns with the listed application and supports reliable combustion under normal street and performance use. The CR8EIX designation identifies the plug family, while 4218 is the stock number used for ordering and cross-reference purposes.
This part cross-references DENSO Auto Parts (e.g., 5362, 5365) for the same application.
Common Issues This Part Can Address
- Misfire caused by worn or inconsistent spark plugs
- Hard starting related to weak ignition output
- Rough idle from degraded plug electrodes
- Reduced throttle response from inefficient combustion
- Maintenance replacement for aging Ferrari F355 Berlinetta ignition service
Installation Notes
Verify the plug gap before installation and confirm the heat range, thread diameter, reach, and seat type match the engine specification. Use the correct torque procedure for the cylinder head material and inspect ignition wires, coils, and boots during service. For 1994-1996 Ferrari F355 Berlinetta applications, confirm the CR8EIX 4218 specification against the vehicle’s service data before final installation.
Quality Assurance
NGK is a long-established OE spark plug supplier with broad coverage across automotive applications. The brand’s North American manufacturing and distribution network supports consistent product availability and OE-style quality control for ignition components.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 1996 | Ferrari | F355 Berlinetta | 3.5L | V8 | N/A | Equivalent OEM design spark plug with 0.025" gap.; Iridium IX Spark Plug |
| 1995 | Ferrari | F355 Berlinetta | 3.5L | V8 | N/A | Equivalent OEM design spark plug with 0.025" gap.; Iridium IX Spark Plug |
| 1994 | Ferrari | F355 Berlinetta | 3.5L | V8 | N/A | Equivalent OEM design spark plug with 0.025" gap.; Iridium IX Spark Plug |
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