NGK Iridium TR6 IX Spark Plugs (.040 GAP) – (Set of 8) GM LSx V8 (One Step Colder for Forced Induction/Nitrous) – 3689-8

NGK V-Power Spark Plugs -.040 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
These TR6 IX Plugs are one step colder than TR55 plugs for nitrous and forced induction applications.�
Product Details-
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 – superior anti-corrosion and anti-seizing properties
Outstanding acceleration, high fuel efficiency and durability
Ultimate design, technology and performance.

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Fits most GM LSX (LS1, LS2, LS6, etc) applications.