NGK Iridium IX TR-5IX Spark Plugs (.040 GAP) – GM LSx V8 Applications (Set of 8) – NGK-7397-8

NGK�Iridium IX�Spark Plugs -.040 Plug Gap What GAP to use? Prior to 2005 GM used .055 GAP�spark plugs on all LSx motors. Starting in 2005, they switched to .040 GAP (this size) plugs�to provide a better idle�when things like cheap gas are�encountered. Any LS2, LS3, L99, or LS7 will come from the factory with a .040 GAP Best replacement plug for stock/midly modified LSx motors. The Spark Plug Serious Enthusiasts Rely On Designed specifically for the performance enthusiast.� Iridium IX offers extreme ignitability, improved throttle response and superior anti fouling Fine Iridium tip ensures high durability and a consistently stable spark Iridium alloy has extremely high melting point, perfect for today�s high-tech, high-performance engines �Trivalent Metal Plating� has superior anti-corrosion and anti-seizing properties Outstanding acceleration, high fuel efficiency and durability Ultimate design, technology and performance Fits most GM LSX (LS1, LS2, LS6, etc) applications.