Replace spark plugs? What Type do I get?

GECONO

MEMBER
2007 CHEVROLET AVALANCHE
5.3L
V8
4WD
AUTOMATIC
170,000 MILES

Pulling up the spark plug product number by VIN, on dealer and GM parts sites gives me A.C. Delco 41-110, and a circle with a line through for availability. Pulling it up by make, model, 8th digit of VIN etc, gives AC Delco 41-162, which are quite a bit shorter. Which is correct?

7 Replies

JONNYB1963

MECHANIC
252 POSTS

AC Delco site also shows the 41-162 Iridium plug for the 2007 Chevrolet Avalanche, 5.3L V8 VIN: J.

AllData Info

Spark Plug Type. GM P/N 12571164
Spark Plug Type. AC Spark Plug P/N 41-985

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Friday, December 21st, 2018 AT 8:05 AM

GECONO

MEMBER
2 POSTS

VIN 3

3gnfk12307g233259.

I compared the two, the 110 is about 3/8 of an inch longer from the seat to the electrode. 41-110 is what was in the truck besides on the GM websites.

From AllData

Spark Plug Type. GM P/N 12571164
Spark Plug Type. AC Spark Plug P/N 41-985

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Friday, December 21st, 2018 AT 9:19 AM

DANNY L

MECHANIC
5,648 POSTS

Hello, I'm Danny.

The correct plug is GM part number #12571164 or AC Delco part number #41-985 The gap is supposed to be 0.040 In (1.02mm). I've also attached a tutorial showing how to change your spark plugs.

https://www.2carpros.com/articles/how-to-change-spark-plugs

Hope this helps and thanks again for using 2CarPros.
Danny-

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Monday, December 24th, 2018 AT 12:11 AM

LNGHAIR7

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2 POSTS
2003 CHEVROLET AVALANCHE
V8
4WD
AUTOMATIC
13,900 MILES

How often do you change the spark plug wires on an Avalanche?

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Monday, July 27th, 2020 AT 5:02 PM (Merged)

JACOBANDNICKOLAS

MECHANIC
109,896 POSTS

I believe the manufacturer says the OEM ones are good for 100K. However, that usually isn't the case. I would recommend aprox every 50K. If you still have the owner's manual, check it for their recommendations too.