NGK Iridium Plug Users Please Step In..
Thread Starter
Teching In
Joined: Nov 2005
Posts: 26
Likes: 0
From: In a Corn Field
NGK Iridium Plug Users Please Step In.. For those of you running NGK Iridium plugs what gap are you using!!! I have read many posts and have not found a definite answer. So here it goes should I use a 0.040 or 0.060 gap, or somewhere in between 
I am confused as hell, especially after seeing the ACDelco Bulletin.
Thanks Guys!!
I am confused as hell, especially after seeing the ACDelco Bulletin.
Thanks Guys!!
Are these things worth it? O'Reilly wants $7.00 each for them, and they don't have any of the regular TR-55's in stock. I was going to check the gap on them in the store, but they guy said not to because they come already pre-gapped and you could easily mess up the center post by a gap gauge. WTF???
Please elaborate.... 
Originally Posted by nbr01f
I am confused as hell, especially after seeing the ACDelco Bulletin...
Thread Starter
Teching In
Joined: Nov 2005
Posts: 26
Likes: 0
From: In a Corn Field
Thanks for the input so far. I am not sure if the plugs are worth it or not. Gm now uses a replacement Iridium Plug for our cars (Instead of the Double Plat. Ones) and many other gm vehicles. The new plugs are gapped at 0.04 at the factory. The NGK Iridium plugs are gapped at 0.06 from the factory. So I am confused because GM is using a 0.04 gap and NGK is using a 0.06. So for the hell of it I gapped the plugs to 0.04 and have not really noticed a difference. If you are careful and use a spark plug gapper with blade style feeler gauges you shouldn't have a problem gapping the plugs. On the other hand if you use the bent wire style gauges you might damage the plug.
I am currently trying to track down misfire issues and I thought the gap might of caused it, but it didnt..
I am currently trying to track down misfire issues and I thought the gap might of caused it, but it didnt..
