i know i remember seein a thread about aftermarket spark plugs for the LNF but cant ****** find it lol. are there any goods ones out there? i heard there wasnt.......if there is let me cause i have looked almost everywhere and cant find aftermarket plugs for them.......if u can post a link for ur finds........thanks alot

 

So far it sounds like everyone is going with the stock plugs. I know NGK has some, but the stock are supposed to be NGK. I dont think they are cause the AC Delco profesional plugs say NGK right on them and ours dont. I am going to try the NGK's in the spring, but for now the stockers are sufficient.

 

6509's are ~1 range colder, (LTR6IX-11)

6510's are ~ 2 ranges colder. (LTR7IX-11)

I've been running the 6510's gapped at .032 for about 5k miles now with extra boost. Runs well, no misfires. 95% highway miles though.

 

i pulled my plugs and they said AC Delco lol.......i checked on NGKs website couldnt find any.......do u have a link?

 

No. I went to autozone to price them out. They were like 8.00 a piece. The ACDelco's have NGK stamped in the part where you put the socket to put them in and take them out. The stockers dont have that. The only ones I found of the AC's where for the vette. Those even say made in japan and NGK on them.

 

So, you are running two ranges colder than stock, and have zero issues?





You must never rev past 4k.

Ever.



Stick with stock ACDelco plugs, and change them often if you're tuned.

 

I use Autolite iridiums- https://www.zzperformance.com/cobalt...1005&catid=143

 

Should have known ZZP was gonna step in with what they run, and they must work!! LOL

 

On your site it says they are a colder range, so how much colder over stock if I can say it that way are they. And the part number.

 

http://www.autolitesparkplugs.com/re...1442862&mfid=5

I got that off the autolite web site

 

I love how the autolite site says .43 gap when it is .30 -.35 for the ss/tc nice. My car runs better with new stock plugs at .32 than it did with the autolites dont know why?

 

I went to the dealer and grabbed same as stock plugs, they were $7-$8 a piece IIRC. They came gapped to .035 like they should be. I went to .032 tho for other reasons.