R500 DURATEC - IRIDIUM SPARK PLUGS

[Shortshift]

Until now I have used conventional NGK BR7EFS plugs in my Duratec R500 but around two years ago I bought (but didn't fit) a set of NGK's iridium plugs, based on a recommendation from someone (and I can't remember who!).  The new iridium plugs are type BR7EIX. 

Any comments on guidance on the Iridium plugs for this application?  I'd feel happier if, before fitting them, I could recall who recommended them as the correct type for this engine but hopefully there will some appropriate wisdom here to help me out.  Basically, should I or shouldn't I?

James

[7 wonders of the world]

Aside from being roughly 3 times the price of normal NGK's, they offer a stronger spark but more important is make your you have the correct gap, most of these come gapped for tin tops many at 1.3mm - too wide for yours.

There's nothing at all wrong with the stock NGK though.

[elie boone]

I gap the plugs at 0,9mm, works just fine.

[7 wonders of the world]

Depends on your engine spec Elie, static and dynamic CR cams etc all have a bearing on cylinder pressure.

[Shortshift]

With the 'standard' BR7EFS plugs I run them at around 0.95mm.

So if the view is that the Iridium plugs are fine to try (no-one is saying "don't do it"), should I stay with the same gap?

James