Nitrous on a 340 100 shot

crackedback said

If you can hear detonation, it was already there before being audible.

Pull the plugs, look for specks on your porcelain. Specks are usually material shedding off thing that should not be shedding (pistons).

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I didn't really see any specs in the porcelain, maybe microscopic but hard to tell. I suppose I should hit the nitrous and check the plugs ground straps for discoloration. I just pulled them iut now and they are light colored past the curve and towards the bottom. But I drove normally on them home for 15 minutes. Any suggestion on reading the spark plugs for heat range and timing?