I'm pretty sure sure these plugs are okay. I ran a wot throttle run then parked it to look at the plugs. I'm running a 6lb lower and 75 dry shot on them. NGK-TR6 gapped.037. 93 octane.
Waiting for the 150 wet then I'll try the IT-24's

 

Looks okay. A little white/lean. I prefer a more chocolate color just to be safe.

 

Alittle lean to me, not TO bad....

Use some 100oct or so in there and you should be fine....

 

They look great, but...


...you gave no indication of miles on them, or use to which they were subjected.

For example, if you were reading plugs used performance driving, you'd run it hard and shut it off and look at the plugs right after the intended use.

For daily drivers, with occasional high performance blasts, your best hope is to not find hot spots or splashes of silvery/shiny patches on the insulator (indicates high temp knocking and/or metal burning and depositing -- a real no no).

If those plugs are old (and were in a 'normal' engine), they'd be among the best I've seen.

Since you're using nos, SVTMoonshine's comment has merit -- since overheating to white could be masked by the tan if there is a vast difference in running temperatures (like nos, heh heh).

 

Those plugs are 2500-3000 miles old. I ran about a 1/4 mile with a 75 hp shot before I removed them.

 

easterisland....sorry this is off the topic, but could you e-mail me some pics of your nitrous setup. BriCJ13@aol.com

Thanks