Iridium Spark Plug

The ACDelco Iridium Spark Plug 41-156 is a GM Original Equipment spark plug, representing the latest in spark plug technology and serving as an exact replacement for your vehicle's original components. Its iridium composition offers a high melting point and superior strength, providing excellent wear resistance and durability. Constructed with precision, the iridium plugs are laser-welded for durable, reliable connections. A three-piece fired-in suppressor seal is integrated to meter spark energy for extended electrode life, prevent combustion leakage, and shield vehicle electronics from radio frequency interference. The plug itself is engineered with a standard center electrode design and a platinum ground electrode tip. ACDelco GM Original Equipment parts are designed, engineered, and tested to rigorous standards and are validated by General Motors. The manufacturer specifies that these spark plugs are pre-gapped during manufacturing and advises against attempting to gap them, as this could cause damage.