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The LT4 uses 6 range (one step colder than ss), with my round of bolt on stuff, I did NGK LTR7IX-11, the first thing I was told to change by Vengeance before tunning... something I did notice is that these cars pull timing even in factory form unless running a boost additive. The new plugs just compensated for the additional heat in the cylinder, without them, I probably would be pulling even more timing. Should be noted, they also come pregapped about the same as factory specs which is what really matters to prevent fouling, they get plenty of heat the stay clean and a nice large gap to burn as much fuel as possible without any blowout what so ever.
If you want to run more timing, E50 did the trick for me.... I have a very happy fuel system 2900 psi at the rail, 80psi low side, inj around 5.4ms, and 23° of timing at wot every single time.
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