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ACDelco Iridium Spark Plug, Set/8

  • Iridium offers better engine idle stability and smoother performance
  • Iridium allows for smaller, more efficient electrode designs for improved cold starting and quicker acceleration
  • Iridium fine-wire electrode helps improve ignition of the fuel and burns away carbon deposits on the tip of the plug as they form, to help improve fuel economy
  • One piece suppressor seal blocks radio frequencies that can affect vehicle electronics
  • Suppressor seal meters spark energy for longer electrode life and seals against combustion leakage
  • Chevy small block Gen III/IV (LS-based engines)
  • Set of 8
Pricing: $55.76


ACDelco Professional Iridium Spark Plugs are the ideal high quality replacement for many vehicles on the road today. They are the latest in spark plug technology and an exact replacement for your vehicle’s original components. Iridium composition has the highest melting point and strength of all metals. It provides the greatest wear resistance and durability over Platinum and Conventional spark plugs. ACDelco Professional Iridium Spark Plugs provide the best wear resistance and durability of any spark plug. These premium aftermarket replacement iridium spark plugs are manufactured to meet and exceed your expectations for fit, form and function.

ACDelco’s Professional Spark Plugs meet a wide range of vehicle applications and budgets, making them the perfect choice when it is time to replace your plugs. Choose from our Double Platinum, RAPIDFIRE single platinum, Conventional, Marine, and Outdoor Power Equipment lines depending on your performance needs. Diesel vehicle owners can also get the ACDelco advantage with our high-quality Glow Plugs. We’ve got a spark plug for almost any vehicle on the road today.

Regardless of the vehicle or the application, you can bet that there is an ACDelco Spark Plug to do the job – and do it well. Whether you are choosing Professional or Specialty spark plugs, from our Iridium, Double Platinum, RAPIDFIRE single platinum, Conventional, Glow Plug, Marine, or Outdoor Power Equipment lines, you will know that you are getting a century’s worth of experience and know-how packed into that plug. Advanced features and competitive warranty coverage adds up to the ACDelco advantage – put it to work for you.


Chevy small block Gen III/IV (LS-based engines)


  • ACD-12621258-8
  • ACD-12621258-8
  • GM
  • New


Shipping Information

  • Item Requires Shipping
  • 2.5 lbs.

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