ACDelco Iridium Spark Plugs 41-103 6-Pack — Professional Long-Life OEM-Fit for Gas Engines

The ACDelco 41-103 Professional Iridium Spark Plug (6 pack) is a high-durability ignition replacement built for consistent performance and extended service life in compatible gasoline engines.

These professional-grade iridium plugs are engineered for reliable spark conduction, improved wear resistance, and stable combustion over longer intervals than standard copper plugs. Packaged as six individual plugs, the ACDelco 41-103 suits routine maintenance or multi-cylinder tune-ups and fits many modern passenger cars and light trucks that specify an iridium electrode design.

How does this spark plug improve engine reliability?

Iridium, a high-melting-point metal, forms a fine-tipped center electrode that requires less voltage to fire and resists electrode erosion. The precise spark gap and durable construction help maintain consistent ignition timing and combustion quality across thousands of miles.

• Fine iridium center electrode for lower required firing voltage
• Stable spark gap retains performance over longer intervals
• Reduced electrode wear compared with standard materials
• Manufactured to OEM-style specifications for fit and function

What fits and installation details should I know before buying?

The ACDelco 41-103 is sold in a six-pack to cover multi-cylinder engines or scheduled replacements. Confirm compatibility with your vehicle’s year, make, model, and engine code before ordering; correct plug reach, thread size, and heat range are essential for safe installation and optimal performance.

• Package contains six plugs — ideal for 4- or 6-cylinder tune-ups
• Verify OEM cross-reference or vehicle application guide first
• Torque to manufacturer specs and use anti-seize if recommended
• Inspect ignition coil boots and wiring during replacement

How long will a set typically last and when should I replace them?

Iridium plugs usually outlast conventional copper plugs, often providing many tens of thousands of miles of service when used under normal driving conditions. Replacement intervals vary by vehicle and driving style, so follow the vehicle manufacturer’s service schedule and check plugs for fouling, wear, or physical damage at recommended intervals.

• Extended service life versus standard plugs under normal conditions
• Inspect at scheduled maintenance or if drivability issues appear
• Look for signs: heavy deposits, rounded electrodes, misfiring
• Replace as a set for even performance across cylinders

What packaging and physical details are included with the 6-pack?

The product ships as six individual spark plugs in a compact package optimized for storage and transport. Packaging dimensions and weight make it easy to keep on hand for roadside repairs or routine shop inventory.

• Item package dimensions: 5.19 L x 4.28 W x 0.93 H inches
• Package weight: 0.65 pounds — lightweight and compact
• Includes six spark plugs for multi-cylinder replacement
• Packaged to protect electrodes and threads in transit

Who this product is for: The ACDelco 41-103 Professional Iridium Spark Plug (6 pack) is aimed at DIY mechanics, independent repair shops, and vehicle owners who want a durable, OEM-style iridium replacement for routine tune-ups. Choose this set if your vehicle’s service manual calls for an iridium plug or if you prefer a longer-life option to reduce the frequency of replacements while maintaining consistent ignition performance.