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Old 12-31-2012, 02:28 PM   #1
Spooky_pitboss
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Question New plugs - Stray from OEM Delcos?

I pulled my plugs out the other day, and they looked pretty decent. A little white-ish, but nothing terrible. Any advantage to getting anything other than the stock P/N : 41-985 Iridium AC Delco plugs? I'm mildly modified, long tubes, 224R cam, full catless exhaust, "Hardcore" intake, and some other small bolt-ons. Wasn't sure if straying from the OEM Delco Iridium plugs would benefit me at all, or just stick with what my trusty service manual says.

Also confused if P/N 41-985, and P/N 41-110 is the same exact OEM plug???

Here's a few cell phone pics. Changed the plugs around some time ago to P/N 41-985. Just pulled the plugs in the pics at about 80,xxx miles. Was expecting one side of the motor's plugs to be a bit fouled up. Long story short, after the intial cam install startup, I didn't have the driver's side coil's plugged in and it was run for a few mins. It was running crazy rich out of one side, which I think took out my driver's side upstream O2 sensor (catless) out a few months after the cam/dyno tune. But maybe it's just me, but the plugs don't look to bad. They've been in there for about 30,xxx miles since they were changed.





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Old 12-31-2012, 02:28 PM   #2
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also, the pictures were under a bright LED worklight, so the white is a bit over exaggerated.
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Old 12-31-2012, 02:37 PM   #3
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Opinions on spark plugs (and wires) are about as varied as the opinions on the best tire, best wax or best way to build a fire in a fireplace.

If your plugs look that good after 80K-plus miles and you're happy with the car's performance, then I think I'd stay with the stock plugs and wires.
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Old 12-31-2012, 02:41 PM   #4
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Quote:
Originally Posted by Wizard of Iz...View Post
Opinions on spark plugs (and wires) are about as varied as the opinions on the best tire, best wax or best way to build a fire in a fireplace.

If your plugs look that good after 80K-plus miles and you're happy with the car's performance, then I think I'd stay with the stock plugs and wires.

That's what I kinda figured. Just didn't know if a mildly modified car would benefit from something else.

Can you tell me what mufflers to get instead?
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Old 12-31-2012, 02:50 PM   #5
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Dropping down one heat rating for every extra 100 hp is the genera rule of thumb. I went to TR6s after the cam. I'd say you're on the borderline for them.
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Old 12-31-2012, 02:53 PM   #6
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Reading a plug by what the grounding Strap color is can be misleading. Put it under a microscope and take a look up inside the plug,surrounding the electrode. That will give you the most accurate reading.
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Old 12-31-2012, 04:14 PM   #7
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I will say Summit has a pretty good deal on some MSD wires. Nothing against the stockers, just throwing it out there. I found them for $55.00 from a different vendor with free shipping. Summit matched no problem.
http://www.summitracing.com/parts/msd-32819
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Old 12-31-2012, 04:56 PM   #8
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I would run TR 55s at .04
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Old 12-31-2012, 05:06 PM   #9
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Hard to beat the AC irridium plugs ! As was already stated if they look good and she,s running good, than go with what works ! Since their out I would replace anyway ! IMHO !

MIKE
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Old 12-31-2012, 08:26 PM   #10
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Quote:
Originally Posted by GTO MIKE...View Post
Hard to beat the AC irridium plugs ! As was already stated if they look good and she,s running good, than go with what works ! Since their out I would replace anyway ! IMHO !

MIKE

I agree with this.
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Old 12-31-2012, 11:22 PM   #11
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Quote:
Originally Posted by Hitman9...View Post
I will say Summit has a pretty good deal on some MSD wires. Nothing against the stockers, just throwing it out there. I found them for $55.00 from a different vendor with free shipping. Summit matched no problem.
http://www.summitracing.com/parts/msd-32819

I actually already have some MSD wires, I toasted one of my stock wires on my headers, so I replaced them all.
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Old 12-31-2012, 11:24 PM   #12
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What's the difference in the TR6s, and the TR55s?

I'm not sure, but isn't iridium the best conductor?
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Old 01-01-2013, 12:32 AM   #13
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Quote:
Originally Posted by Spooky_pitboss...View Post
What's the difference in the TR6s, and the TR55s?

I'm not sure, but isn't iridium the best conductor?

TR6 is a step colder, I would run TR55 if N/A, and copper is your best conductor, tests show iridium is actually a worse conductor then copper. iridium just last longer. GTO plugs are super easy to change, throw you some cheap copper or platinum plugs in there and run to the plug manufacturer change interval. NGK is a highly popular plug here, but AC works just fine.

I run the new Bosch Finewire Platinum's, just to try them out & only 2.99 each with $1 rebate. They seem to do pretty great to be honest. Very nice quality plug and far superior to anything Bosch as made in the past. Steer away from gimmick plugs like +2 or +4 plugs. I have seen power loss on dynos from a poorly firing "gimmick" plug. I like just about any plug with a "fine" tip though. From what I have learnt from running a Advance Auto store, NGK is a manufacturer of AC's anyway, someone correct me if I'm wrong. I'm not a fan of AC plugs due to them not being ribbed on the glass side. Not that big of a deal, and really make very minute difference. I'm just OCD about that stuff. Non-ribbed plugs is a older design. Different strokes different folks. I know I'm weird lol.


Last edited by Hitman9; 01-01-2013 at 01:01 AM.
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Old 01-01-2013, 04:58 AM   #14
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I have a set of 41-110's and a set of ACDelco wires waiting to go in. I'm just bolt ons so I see no need to change heat range.
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Old 01-01-2013, 06:23 AM   #15
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Quote:
Originally Posted by Hitman9...View Post
I'm not a fan of AC plugs due to them not being ribbed on the glass side.... I know I'm weird lol.

http://www.youtube.com/watch?v=wFkCVNhXMF0

Yeah, that's weird. The ribbing is for HER pleasure.
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Old 01-01-2013, 08:05 AM   #16
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So if I understand correctly, one step in a colder plug, is a "safer" choice over a stock heat range?
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Old 01-01-2013, 11:01 AM   #17
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OP you could probably use either. The TR6 is mostly used by H/C guys and nitrous guys
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Old 01-01-2013, 11:03 AM   #18
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The spark plugs in my car were $10
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Old 01-01-2013, 11:09 AM   #19
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Quote:
Originally Posted by mistermike...View Post
Yeah, that's weird. The ribbing is for HER pleasure.

Thanks mistermike. Hey if shes happy then I'm happy...what am I saying? I could care less. haha
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Old 01-01-2013, 11:15 AM   #20
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Quote:
Originally Posted by Spooky_pitboss...View Post
So if I understand correctly, one step in a colder plug, is a "safer" choice over a stock heat range?

Yea colder plugs are safer. To the best of my knowledge, the Goats come with a 6 heat range plug to being with, we broke the mold when we went to a 5 heat range, putting a little spice in the cylinder.
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Old 01-01-2013, 11:15 AM   #21
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Quote:
Originally Posted by 04QSMGoat...View Post
I would run TR 55s at .04

I just ordered those this morning.

I've read about every thread about plugs, and these seem to be the tried and true.

Also OEM wires.
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Old 01-01-2013, 11:17 AM   #22
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Not to thread jack, but when do we need to change the plugs and wires???

I'm at 41k miles and I am going to change the plugs regardless of how they look.. Its just a few dollars.

What about wires? When should they be changed out?

TIA
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Old 01-01-2013, 11:22 AM   #23
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Quote:
Originally Posted by Alexander...View Post
Not to thread jack, but when do we need to change the plugs and wires???

I'm at 41k miles and I am going to change the plugs regardless of how they look.. Its just a few dollars.

What about wires? When should they be changed out?

TIA

I think the GM manual suggest 100,000 mile intervals.
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Old 01-01-2013, 11:31 AM   #24
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Quote:
Originally Posted by Alexander...View Post
I'm at 41k miles and I am going to change the plugs regardless of how they look.. Its just a few dollars.

TIA

Don't feel bad, I'm at 70,000 miles and have changed my plugs 5 times, with dyno pulls and such. Sometimes I like to try different stuff.
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Old 01-01-2013, 12:05 PM   #25
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Quote:
Originally Posted by Hitman9...View Post
I think the GM manual suggest 100,000 mile intervals.

Quote:
Originally Posted by Hitman9...View Post
Don't feel bad, I'm at 70,000 miles and have changed my plugs 5 times, with dyno pulls and such. Sometimes I like to try different stuff.

Thanks.

So I should be safe to keep the original wires in?
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Old 01-01-2013, 12:06 PM   #26
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So if I order some TR55s, and there's nowhere to specify a heat range, that's ok? There's no heat range documented with any 41-985 Delco Iridium plugs either.
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Old 01-01-2013, 12:11 PM   #27
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GM wires have a lifetime warranty and at nearly 90k miles with tons of track time OEM plugs still look perfect.
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Old 01-01-2013, 12:23 PM   #28
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Quote:
Originally Posted by Spooky_pitboss...View Post
So if I order some TR55s, and there's nowhere to specify a heat range, that's ok? There's no heat range documented with any 41-985 Delco Iridium plugs either.

TR55 is a great plug and commonly used. Heat range is a 5. Summits website shows heat ranges.

http://www.summitracing.com/parts/ngk-3951



Quote:
Originally Posted by Alexander...View Post
Thanks.

So I should be safe to keep the original wires in?

Stockers work fine, they come in at about 760 OHMs per wire. Not too bad. But if your a mod addict. I'd pop on some MSD's, which come in at 25-30 OHMS per wire & are 8.5mm, pretty dang good. But as stated stockers do work and work well. Just a owners money and preference.

Last edited by Hitman9; 01-01-2013 at 12:25 PM.
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Old 01-01-2013, 12:27 PM   #29
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BTW the link I posted is for a copper V-power plug (3951) if your interested in the iridium series you need a 7164 NGK IX.
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Old 01-01-2013, 12:33 PM   #30
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lol I almost feel guilty spending like $2.50 on a plug, compared to what OEM is at around $7-$8 per plug.
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