






🏁 Ignite your engine’s true potential with Autolite AR3910X!
The Autolite AR3910X 4-pack racing spark plugs feature a Yttrium-enhanced alloy that reduces side wire temperature by 8%, supporting durability and preventing pre-ignition. Designed with colder heat ranges for modified engines, these nickel-plated plugs deliver faster ignition and corrosion resistance, making them a top choice among professional racers and performance enthusiasts.





| Brand | Autolite Iridium Ultra |
| Core Material | Nickel |
| Thread Size | 14mm X 1.25 |
| Top Material Type | Alloy Steel |
| Vehicle Service Type | Car |
| Global Trade Identification Number | 00009100031105 |
| UPC | 009100031105 |
| Manufacturer | FRAM |
| Model | AR3910X-4PK |
| Product Dimensions | 3.56 x 1.14 x 0.41 cm; 54.43 g |
| Item model number | AR3910X-4PK |
| Manufacturer Part Number | AR3910X-4PK |
| Position | Center |
| Colour | Neutral |
| Assembly Required | No |
| Manufacturer | FRAM |
| Country of Origin | USA |
| Item Weight | 54.4 g |
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