Well yesterday I changed my spark plugs to ngk bkr7e's and i was surprised to find that my car already had ngk spark plugs in it. they werent exactly the same as the ones i put in though. I thought that was weird because I have never changed the plus and i have had this car since new.

So the question is do they come with NGK's from the factory?

 

i belive so

 

pretty sure the stock plugs are ac delco, at least in the 2.4 not sure about the 2.0

 

Cobalt SS/SC comes stock with NGK double platinum plugs.

 

Yes.

 

ic...i thought a dealer had already replaced my spark plugs when i got stage 2 maybe

 

I dont think they should be bkr7e though cause that is one step colder than stock i believe.

 

In the 2.4L at least (and I think the LSJ is the same) the BKR7E is 2 steps colder. The thing I would be leary of is that the NGK BRK series plug has a standard flat seat with a washer. The stock plugs use a beveled seat. The BKR series are also too short for our head. The stock plug has a 25mm reach where the BKR plugs are only 3/4" or 19mm. I've been researching plugs for about 6 months because of my N2O setup. I called and talked to an NGK tech, and the perfect plug is the LTR7IX-11. Been using them for about a month, great plug.

 

yeah stock are ngk's

 

stockers in a SS/SC are NGK.

 

what Raineman said.

 

Do you know why he determined that specific plug? The website part finder recommends PFR6T-10G with a 0.040 gap for the LSJ.

 

bkr7e is what i put in

 

Don't know accept that a number of people have been using the BKR series plugs and don't seem to have any problems with them but, they are not the correct plug. I would doubt though that they give the same performance. Sorry I also don't know about the PFR series either but, I have seen were some cross reference guides say the PFR series are a stock replacement. One thing I can tell (that you may or may not already know) is that the number determines the heat range. Our engines stock should use the "5". The "6" of course would be one colder, and the "7" would be two. Besides the heat range, the 3 other things to look for is the seat, the reach, and last, the length of the electrode. Standard electrode and Iridium plugs are Ok for N2O or other forced induction applications, you just don't want to try to use platinium plugs.

 

The stock LSJ plugs are equiv to the 6 series NGK plugs. So the 7's are one step colder on the 2.0 not 2

 

I use the one step colder BKR7's in the summer becasue it calls for it in the GM build book once you start modding it.

 

The strokes are different on the LSJ from the 2.2 and 2.4 motors. The BRK is the stock plug type for the LSJ motor.

 

Yea... I did some more research on the LSJ motor and the NGKs and your right. The head on the 2.2L 2.4L vs LSJ are different. Appearently the LSJ does use a 3/4" reach and a flat washered seat so your right, I'm wrong. My bad... Oh well, I learned something today, and that's a good thing.