Spark plug.
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Le Mans Master
Joined: Jun 2019
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From: Loveland
Spark plug.
Kind of interesting. I decided to change plugs. I got the OEM 41-114 plugs. The spec is supposed to be .040 inch. I have only changed one so far, when I removed the old plug, it's gap was .038. I know that isn't that big of difference, but they are probably original plugs. They probably don't even need to be replaced.
It's a 2014 LT1
It's a 2014 LT1
Last edited by kodpkd; May 27, 2026 at 12:51 PM.
Melting Slicks
Joined: Jul 2019
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From: MA/NH Seacoast
That's probably within an excepted tolerance for GM.
Seems like every plug I've bought, regardless of brand, gaps them in .05 increments. So it's strange seeing a set in .038, but it happens.
Seems like every plug I've bought, regardless of brand, gaps them in .05 increments. So it's strange seeing a set in .038, but it happens.
Last edited by Tranz Zam; May 27, 2026 at 01:07 PM.
Drifting
Joined: Jun 2013
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From: Iowa
Kind of interesting. I decided to change plugs. I got the OEM 41-114 plugs. The spec is supposed to be .040 inch. I have only changed one so far, when I removed the old plug, it's gap was .038. I know that isn't that big of difference, but they are probably original plugs. They probably don't even need to be replaced.
It's a 2014 LT1
It's a 2014 LT1
Thread Starter
Le Mans Master
Joined: Jun 2019
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From: Loveland
From Amazon. The strange thing, Amazon said they didn't fit the 2014 LT1. They were exactly the same as I removed. The ones I removed were all .039-.038. Probably an exercise in futility. 
ACDelco GM Original Equipment 41-114 (12622441) Iridium Spark Plug
Drifting
Joined: Jun 2013
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From: Iowa
Did GM change the PN by chance? On my truck I had to do a little digging as GM has a new PN for it so it was a little confusing.
Thread Starter
Le Mans Master
Joined: Jun 2019
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From: Loveland
That's a good question. I was beating my head against the wall trying to find the correct plug. There are so many options. I think there is a GM plug that is supposed to take the place of the original 2014 ACDelco 41-114. All I know for sure, is, this is what was in the car from new, so I used it. They are supposed to last a LONG time, so I figured I would change them for the last time.
The other reason I decided to change the plugs. I am changing the valve springs from the BAD yellow springs, to the new and improved springs, so I figured, as long as I was in there.
The other reason I decided to change the plugs. I am changing the valve springs from the BAD yellow springs, to the new and improved springs, so I figured, as long as I was in there.
Last edited by kodpkd; May 27, 2026 at 07:58 PM.
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Haven't changed my plugs in my 2014 yet as I only have 10K miles on the car. But your post has me wondering if the gap on my plugs are .038 or different.
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The difference between.040 and .038 doesn’t matter. And unless you’re nearing 100k miles there’s no reason to replace the plugs. My Owner’s Manual says the plug change interval is every 97,000 miles.
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The oem plugs are a long-lasting part, unless you have 100k miles on the car, "don't fix it if it aint broke"
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Le Mans Master
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From: Loveland
You guys are correct. I wouldn't have even considered it, but I have them out, so for $55, I thought I would change them. The plug wire will probably go bad before the plugs.
But, wow, my car runs SO much better. Just kidding.
But, wow, my car runs SO much better. Just kidding.
Pro
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I don't know if my plugs were original, I think they were, but I replaced mine at around 50k miles. I have a 2014 with a supercharger. I made a post on here that showed my plugs. The gap was correct but the ground electrode was being hollowed out. This meant my gap wasn't really correct. So I suggest not just checking the gap and main electrode condition, but looking at the underside of the ground electrode also.
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