






⚡ 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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