AC Spark Plugs....
Thread Starter
Melting Slicks
Joined: Sep 2004
Posts: 3,024
Likes: 18
From: DFW Texas
AC Spark Plugs....
In the middle of changing out spark plugs.
AC 41-952 25171803 are the plugs that are in it now. Does anyone know what the gap should be on these?
Or, would autozone carry a different/better plug and if so , what, and what would be the correct gap?
Here is what is in them now looks like with 53k on the clock
~~
The gap look HUGE!
Need info quickly please so I can finish tonight!
AC 41-952 25171803 are the plugs that are in it now. Does anyone know what the gap should be on these?
Or, would autozone carry a different/better plug and if so , what, and what would be the correct gap?
Here is what is in them now looks like with 53k on the clock
~~
The gap look HUGE!
Need info quickly please so I can finish tonight!
Safety Car
Joined: Oct 2000
Posts: 4,949
Likes: 10
From: Monticello MN
Originally Posted by MAC5
Those old AC's have been replaced by AC 41-985's. They come pre-gapped at .040 and should not be regapped.
MAC
MAC
However, when I bought the 41-985s, I checked the gap on all of them before I paid. they were "dead-on". They work great! BTW: they are iridium plugs.
Ed
Pro
Joined: Apr 2005
Posts: 666
Likes: 5
From: Mt. Pleasant SC
Let me chime in with confirmation that the gap on the AC Delco Iridiums should not be changed. I made the mistake of gapping mine to the specifications in my owner's manual (.060) which is correct for the original dbl platinum factory plugs (AC Delco 41-952). After installing the new Iridiums along with new MSD Super 8.5mm wires, I had EMI on a couple of my FM radio channels. Thought the new wires were bad. Then I read on AC Delco's web site that the gap on the Iridiums are set at .040 and "should not be changed". So I pulled out all the plugs and fixed to the proper gap. No more EMI. Imagine that! I Learned a lesson here.
