View Full Version : Spark plugs...what are you running?

05-28-2012, 05:34 PM
Ok guys, decided to pull the plugs on the z today and damn! What a mess these things are, not to mention a total pain in the balls! 1, 5, and 7 weren't bad at all. But 3, and all the right bank are going to kick me in the nuts wicked hard here. Pulled all the odd bank and they looked like garbage. Weird thing is that they all looked like the oem plugs. All are AC Delco 41-952. Now I know GM discontinued these in favor of the iridium plugs, 41-985.

Just wondering what everybody else with the LS1 engines are running in their cars, also what trick do you have for removing the even bank plugs, removing the coil packs and bracket or?

05-28-2012, 11:52 PM
NGK #3951 Tr-55 plugs. About $25 for the set.

Pass side- remove coils.

05-29-2012, 01:28 AM
i run the NGK's as well. good plug.

05-29-2012, 02:23 AM
Tr55 for na

05-29-2012, 07:45 AM
same here

05-29-2012, 11:26 AM
Have heard some really good things about the ngk tr55's. Ordered some delco 41-110's off ebay. Will give em a shot and if they're junk, I'll be going with the ngk's.
Looks like the delco's that were on the car might've been the originals, I'll snap some pics of the old plugs, man these things are sexy! lol

06-01-2012, 12:09 AM
ngk tr55's here

*LS1* Queen
06-01-2012, 03:06 AM
running the same ngks as everyone else lol

06-01-2012, 06:49 PM
Well I will be different. I run ngk br7ef gapped at .32. I have nitrous so I use a colder non projected tip

06-01-2012, 11:47 PM
I use the ngk tr55ix in my car, no complaints here

06-02-2012, 01:04 PM
I've got the nos kit hooked up in the car, but no bottle attached to it right now. Tends to add much unwanted attention in my daily commute to and from work, not to mention all the shitheads who think they have something to prove. Just like in boomer's sig, nos is like a hot girl with a std, you know you wanna hit it, but are afraid of the consequences!

Anyways, I got some delco's from eBay and going to put them in this weekend. Also ordered a set of the ngk tr55's as well just to have on hand in case I'm not particularly fond of the performance with the delco's. Stock gap on the new delco's (41-110) set at .040 in favor of a more dd type vehicle. Not sure if I'm going to like these plugs on the performance side, but worth a shot.

In any case, going to give them a try and will put my input on them vs what is installed in there now in about a month or so.

Thanks for all the input guys!

06-02-2012, 01:19 PM
If I were you, id just throw the ngks in. theyre most likely better than delcos. Plus as I sure you know, NGK is a very reputable company

06-02-2012, 03:37 PM
E bay= plugs?

Alot of local places have them.

06-02-2012, 07:55 PM
NAPA/advanced/vato-zone/even pepboys make a trip to one and find them.

06-02-2012, 08:38 PM
E bay= plugs?

Alot of local places have them.

Yeah, just for the delco's. Saved almost $2 each plug from going to autozone/pep boys/advance big box stores shipped.

Bought the NGK's locally, paid a bit more for em, but rather see a local guy get the extra coin than a national retailer.

06-03-2012, 12:12 AM
if your spraying you should run tr6's. you never mentioned spray.

06-03-2012, 01:07 AM
Pizzas right, the tr6's are for forced induction or nitrous applications. They have a colder heat range. How often do you spray?

06-03-2012, 02:14 AM
Ya, tr6 for spray.

06-04-2012, 04:09 AM
The car is fully setup for a wet kit ported into the slp lid when it was purchased from the previous owner. He wasn't sure what size jets were put into it and never adjusted it because it hasn't had a filled bottle on it yet. Not really planning to toss one on in the near future. Got a few other things to take care of before spraying it: intake, heads and cam. Already got the Lingenfelter LS1 intake, just have to find a decent set of heads and a cam package for a mild application that can still be used as a daily driver and get roughly the same gas mileage as I'm getting now.

Got the delco's in the car today, only took me a hour and a half. Not too bad for the first time replacing the plugs on this car. Definitely going to take a lot less next time. Think it took me about 30 mins alone just getting that last damn bolt off the coil pack bracket by #8.

JAB Racing
06-05-2012, 02:55 PM
tr6's if ur gonna spray the car. and check them after each bottle. thats what i do and i have been spraying the car for 4 years ona stock bottom end w 161000 miles. low 10's for the last year or so.