Autolite® Copper Core Spark Plugs

Autolite® Copper Core Spark Plugs


Part Number: LSJ-ASP-3922

Shipping Weight: 0.50 pounds

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  • 2005-2007 Cobalt SS with LSJ (supercharged) engine
  • 2004-2007 ION Red Line with LSJ (supercharged) engine
Autolite® Copper Core Spark Plugs feature a copper core center electrode sheathed in high chromium-nickel alloy for superior heat dissipation and durability. The longer insulator nose provides a longer path to control fouling deposits, and the mixture of nickel and copper-glass seal bonds the insulator, terminal post and center electrode together, assuring full voltage. In addition, the chromium-nickel alloy ground electrode resists gap erosion.

The stock spark plugs for the LSJ motor are NGK PFR6T-10G platinum plugs. Platinum and iridium plugs are much harder and more expensive metals that can last up to 100,000 miles however they are not the best metal for heat dissipation. In our experience copper based plugs are far superior in supercharged applications and while they may not last as long as platinum or iridium plugs they will offer better performance. In addition to being copper based these plugs are also one heat range cooler than stock which helps reduce the possibily of detonation and the resulting knock retard.

New spark plugs should always be gapped prior to installation. The stock LSJ spark plug gap setting is .045", and that works fine for the lower boost settings. As the boost increase, smaller plug gaps are required to prevent spark blow-out. Following are our dyno-proven LSJ spark plug gap recommendations:

Stage 1 - 3.30" to 3.20" supercharger pulley - .045" gap
Stage 2 - 3.10" to 3.00" supercharger pulley - .045" gap
Stage 3 - 2.90" to 2.80" supercharger pulley - .040" gap
Stage 4 - 2.70" to 2.60" supercharger pulley - .035" gap
Stage 5 - 2.50" supercharger pulley - .035" gap


Autolite® Spark Plugs are sold in eaches. If you want a set of four, please order a quantity of '4'.

Prior to installation, clean the threads of the spark plug holes. We recommend you coat the threads of your Autolite® Copper Core spark plugs with anti-seize, and install them hand tight plus 1/4 to 1/2 of a turn, or torque them to 18 to 21 foot-pounds.

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