ACDelco 41-985
Thread Starter
Safety Car
Joined: Sep 2005
Posts: 4,226
Likes: 643
From: Orange County Ca
ACDelco 41-985
Fairly new to me "09 Vert, stock ls3, with 55K miles.
The car runs fine, but while fiddling around, I thought I would pull a plug.
ACDelco 41-985. Gap was .087. Searching the forums, it looks like the little tip is gone, hence the .087 gap. Also, it looks like the 985 is for a ls2 or ?????
Also, searching the forums I see a few different #'s for oem plugs. 41-104, 41-110,41-162, etc.
Rock auto lists 41-162 pre gapped at .040 as stock.
So, is the 41-162 the correct oem iridium?
The car runs fine, but while fiddling around, I thought I would pull a plug.
ACDelco 41-985. Gap was .087. Searching the forums, it looks like the little tip is gone, hence the .087 gap. Also, it looks like the 985 is for a ls2 or ?????
Also, searching the forums I see a few different #'s for oem plugs. 41-104, 41-110,41-162, etc.
Rock auto lists 41-162 pre gapped at .040 as stock.
So, is the 41-162 the correct oem iridium?
Melting Slicks
Joined: Oct 2010
Posts: 3,028
Likes: 794
From: Tollesboro Kentucky
41-985 should be the original plug number.It has been superceded by 41-110 and then the 41-162.The 41-104 is a colder plug used in the LS7 and LS9.
Last edited by jamieo; Sep 4, 2024 at 11:17 PM.
Thread Starter
Safety Car
Joined: Sep 2005
Posts: 4,226
Likes: 643
From: Orange County Ca
Interesting to hear that the 41-985 were the OEM's. My research showed them to be multi model use, even 5.7 trucks.
Since the 1 I removed was missing the tip and had a .087 gap, I'm going to buy new ones. Rock Auto and AZ both list 41-162 as correct, so I ordered these from RA.
It really surprises me that 1, or more, damaged plugs wouldn't cause a misfire code. And, if not, will the new plugs make it run better?
Since the 1 I removed was missing the tip and had a .087 gap, I'm going to buy new ones. Rock Auto and AZ both list 41-162 as correct, so I ordered these from RA.
It really surprises me that 1, or more, damaged plugs wouldn't cause a misfire code. And, if not, will the new plugs make it run better?
Racer
Joined: Jun 2010
Posts: 415
Likes: 16
From: Toronto
41-985 was the original plug and it had a little puck of platinum on the center electrode, that would fall off, hence the mile wide gap.
41-162 is an iridium Delco plug
41-962 is the replacement platinum for the 41-985.
Either 162 or 962 will be fine....I would use the 41-162 if it was mine.
41-162 is an iridium Delco plug
41-962 is the replacement platinum for the 41-985.
Either 162 or 962 will be fine....I would use the 41-162 if it was mine.
