I just bought some NGK TR55IX (7164). I gapped them at .35. I Dont have Nitrous. Just a big cam setup. Should i take the plugs back out and regap them to .60 or will they be fine at .35?

 

Regap at .055. If you want to get the gap at .035, use the TR5 as it's the same as a TR55 only with a tighter gap (same heat range). Manufacturer recommends only +/- 10 from the box. Since out of the box TR55 is .060, you see why going to .055 is OK.

Just having nitrous doesn't mean automatically gap at .035.

 

Stock compression? Id run the .055 like suggested. Raised compression, I prefer TR6 and .045.