You can use either plug. GM changed the plug use back in 05. I have an 02 Camaro with an LS1 and will be switching to the new plug gap. My dad switched his out on his 02 Camaro with an LS1 to the ew plug gap. The car runs great. Mods on both cars are intake and exhaust.


This should help. Courtesy of NGK on maryland speed's site.

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

This tip is an upgrade over the standard LSx style plugs with better design and performance qualities.

Improved Fuel Efficiency, Lower Emissions, Quicker Starts.

•Fine platinum tip reduces required voltage
•Extremely durable under high heat
•“Trivalent Metal Plating” has superior anti-corrosion and anti-seizing properties
•Faster starts and quicker acceleration
•Better fuel economy and lower emissions
•Best platinum spark plug at an economical cost
Fits most GM LSX (LS1, LS2, LS3, LS6, LS7 etc) applications.