When i did my 60 k service, i changed my plugs to Denso Iridium, now i thinking about getting a 50-75 shot of Nos, Will these plugs be suitable for the nos or will i have to change them???

 

They are VERY suitable for nitrous. I started using them last fall. Even 2 steps colder I ran my fastest N/A time of 13.5. So I just leave them in all the time.

From what I see not everyone gets the same performance, most guys say that running colder copper plugs decreases performance N/A but that hasn't been my experience with either the 3.0 or 3.5L.

 

Is this with the iridiums or other plugs? Do you think the normal heat range is good for a 50-75 shot?

 

Very few guys have tried Iridiums especially colder ones so my comments there are directed towards the copper ones. My experience with the Iridiums was very positive, although I have only tried 2 steps colder.

NGK recommend Iridums for nitrous applications if you read their literature.

I would go at least 1 step colder for a 50-75.

There is a chart here on my web page. http://jime.homeip.net/Plugs.html