Hey guys i have a question? And yes i used the search button. lol i coul not find the right gap for my car.its pretty much stock just look at my mod list to see whats done. well i bought Autolight XP Iridium plugs Part # XP3923 What gap should i run them in my set up? At the part store they told me.040 but that seems really big for me. is that right? i would think like .032-.035 but not.040 IDK ill leave it up to you guys. Thanks Kevin

 

i got my NGK 2 step colder gapped at .38...works perfect. I say try it at .40 and see how it works...if it sputters...gap it to .37ish..all depends what your car likes

 

i had mine at .047 and didnt have any issues

 

40 is stock as far as i know.

 

stage 2 tune with a 2.9 and my ngk coppers.... gap is .36 running lovely

 

Service manual calls for .035 on an LSJ car. People here run anywhere from .035 to .040.

 

so im guessing that i should run between .035-.040 then since i have almost a stock car. Thanks guys

 

Well, what I'd like to know is how some of these people feel better with .038 as opposed to .036, etc. I'm not knocking anyone, I just want to know the reason, lol. The reason I ask is because I just went forced induction but I left my gap at .040 and haven't had a problem.

 

GM states .040 is the stock gap.

 

I just looked at all of the owner's and service manuals from 2005-2007. In each of the different manuals they seem to lists different gaps. I found .035, .039, .040 and .042. lol.

 

my gap is 35 because if i put anything bigger i get carbon buildup so i started stepping down till i did not get any more carbon buildup and i now have normal wear.

 

It looks like theres no real set gap for these cars it looks like. lol

 

I agree. It seems hit or miss.