Changes in AC Delco Iridium Sparkplug Numbers for Chevy V-8s

[Snagglefoot]

Since Iridium spark plugs last so long I fell behind on my sparkplug numbers. About 70,000 miles ago I put in 41-110 sparkplugs. Sometime along the way the number changed to 41-162 and a small “collar” was include in the design. I attached a photo. This design is recommended for all Gen 4 engines.

In 2014 the Gen 5 engines got direct injection and a part number change to 41-114. I believe the 41-110 is no longer made. The pre-2014 V-8’s still get 41-162 Iridium plugs

A second photo shows a 41-114,the. Number of threads is totally different, with 10 for the 41-162 and 17 for the 41-114 .Please fill in the gaps ( no pun intended) if you like.

 

[zfasts03]

I was wondering about this as well as I own a gen 3, gen 4 and gen 5 small blocks and the numbers change and vary more than I can keep up with. I guess with further r&d engineers discover ways to improve? Maybe reduce lspi, improve fuel economy, etc.

On my LS6 in my 03 vette even the gap got reduced significantly with the spark plug number update.

 

[Snagglefoot]

Here is a 41-110 that is currently in my 6.0.

 

[clinebarger]

Gen V engines use completely different cylinder heads than Gen III/IV engines requiring a little more reach.

I believe the 41-162 plugs are not manufactured by NGK like the 41-110 used in Gen IV production. I started using NGK 1465 for 41-110 & 41-162 applications.

 

[zfasts03]

Then there is is the fiasco of wondering if they are counterfeit?

 

[Gyro Gearloose]

I just bought a set of 41-162's from ORielys to replace the OEM 41-110s in my 2010 Yukon. They do look a little different. The best information I could find on the number change was that the originals were made by Denso and the new ones are made by NGK or vice versa. GM supposedly changed the part number when they changed suppliers.

 

[Snagglefoot]

Then there is is the fiasco of wondering if they are counterfeit?

Here is an Amazon shot of an off brand of 41-110. Not really a counterfeit but the potential for printing AC Delco exits.