Mine were also at .028, and I left them at that.

 

I've been gapping my NGK Copper plug (1 step colder than stock) with the round gapping tool at .028 with no problems.

 

Do Not Regap Iridium Plugs....i Repeat Do Not Regap Them!!!!!

After Regapping Mine, Two Of Them Broke Off In The Motor!

 

either you soften the metal too much by gapping to many times or you have major detonation going on.

 

you don't gap iridium plugs.

 

Do not do this!!

You will damage the porcelein and render the plug useless. Spark Plugs are very sensitive. If you ever drop one you might as well pitch it in the trash. This goes for buying them at the store, if they drop it refuse it. I have seen literally 100 plugs dropped that had to be replaced after a couple of miles.

round gappers are designed for used plugs not new, but never iridium plugs.
I wouldn't gap an iridium unless it is way off from the manufacturer.

 

Here is some info from NGK since a lot of the info posted is misleading and incorrect.

http://www.ngksparkplugs.com/tech_su...de=nml#gapping

3. Gapping

Since the gap size has a direct affect on the spark plug's tip temperature
and on the voltage necessary to ionize (light) the air/fuel mixture, careful attention is required. While it is a popular misconception that plugs are pre-gapped from the factory, the fact remains that the gap must be adjusted for the vehicle that the spark plug is intended for. Those with modified engines must remember that a modified engine with higher compression or forced induction will typically require a smaller gap settings (to ensure ignitability
in these denser air/fuel mixtures). As a rule, the more power you are making, the smaller the gap you will need.

A spark plug's voltage requirement is directly proportionate to the gap size. The larger the gap, the more voltage is needed to bridge the gap. Most experienced tuners know that opening gaps up to present a larger spark to the air/fuel mixture maximizes burn efficiency. It is for this reason that most racers add high power ignition systems. The added power allows them to open the gap yet still provide a strong spark.

With this mind, many think the larger the gap the better. In fact, some aftermarket ignition systems boast that their systems can tolerate gaps that are extreme. Be wary of such claims. In most cases, the largest gap you can run may still be smaller than you think.

 

a 6 years old thread lol, you never gap iridium plug

 

snap on sells two different types of gappers safe for platinum and iridium plugs. One is a tool similar to like pliers that presses the ground tip out. One common issue with these is they can snap the tip off easily. The other type is similar to like a mini ruler that has a square/rectangular hole cut out that you use to wedge the tip end on. It adjusts the gap without ever coming near the iridium tip. I use that one all the time on my iridium plugs, and any plugs that I do for customer cars. Any plug can have its gap adjusted except those Bosch +2, +4s with the multiple tips. Those Boschs dont want them to be adjusted, but we dont run them on the evos so doesnt matter. I tried finding some pics of these tools, but snap ons website is horrible, sorry.

 

wrong, you still have to gap the plug