I heard that there is a difference between
installation of platinum and other types of http://www.ngk.com/results_app.asp?AAIA=1305098 plugs.
What exactly the difference?

 

No difference, just use your gap measurement tool to verify that pre-gap is to spec.

 

What is the spec for gap on these?

 

a 42 i believe......not positive though

 

it should be .44 mm

 

http://www.ngk.com/results_app.asp?AAIA=1305098

OE gap = 0.044

That gap measurement tool what does it look like??
Can gap be off from factory??

 

Gap tool is typically round with a lip that increases gradually. The lip as hash marks for each size and measures small to large (typically in mm). $1.00 at Autozone...

About 1 in 5 (in my experience) factory pre-gapped spark plugs are not to spec.

 

The gap should be .044 in or 1.1mm I think.

 

Dont waste your money on the 1.00 round gap tools. Get a good set of feeler/blade gapper.

Just my $.02

BTW thanks for the information on the proper gap.

 

Would anyone recommend using the NGK Iridium plugs?

 

no, iridium is not needed especially if your N/A and not making enough power.

gap for splug should be .035~.044.

 

Got it. Thanks everyone for the help.

 

np.....btw most plugs come gapped around .45