How to gap spark plugs? Are they gapped?

[table5511]

Hey guys, I've got some plugs on the way, ZZJ118110 / MOTORCRAFT SP411 bought from Atlantamazdaparts.com. Do these typically come already gapped, since I ordered them by part# of ZZJ118110 which is CX-9 / Mazda 6 specific (Duratec 3.5/3.7)?

If not, what kind of tool do I need to properly gap between .051" - .057" ?

Thanks

 

[xxxmonoxidechil]

Most plugs need to be gapped before installing. But some specific plugs like Iridium's are pre-gapped. And you can actually damage the electrodes using a standard plug gapper on.

Here's an easy How To for gapping plugs. http://www.wikihow.com/Gap-a-Spark-Plug