






⚡ Ignite your engine’s full potential with race-ready precision!
The Autolite AR3923-4PK High Performance Racing Spark Plug pack features a Yttrium-enhanced alloy that reduces side wire temperature by 8%, a colder heat range tailored for modified engines, and a corrosion-resistant nickel plating. Designed for professional-grade durability and faster ignition, these plugs deliver reliable power and longevity for serious automotive enthusiasts.

| Brand | Autolite Iridium Ultra |
| Core Material | Nickel |
| Thread Size | 14mm |
| Top Material Type | Nickel |
| Vehicle Service Type | Car |
| Global Trade Identification Number | 00009100026576 |
| UPC | 009100026576 |
| Manufacturer | Autolite |
| Model | AR3923-4PK |
| Item Weight | 1.6 ounces |
| Product Dimensions | 1 x 1 x 3.38 inches |
| Item model number | AR3923-4PK |
| Is Discontinued By Manufacturer | Yes |
| Exterior | Chrome |
| Manufacturer Part Number | AR3923-4PK |
| Position | Center |
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