I am about to install a nx express kit. Do I need to change to differant plug.

 

yup, you cant run platinum. you will burn off the electrode when combustion happens and would cause a lean condition and make your pistons go poof!

 

Platinum on the plugs can contribute to detonation. This is because platinum is a catylist.
Platinum plugs don't have a true horsepower benfit anyway. Their benifit is in long life. They don't require as much electrical energy to spark, but don't produce a very strong spark. Go with a good copper core plug. It wouldn't be a bad idea to go a heat range or two colder.

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Tracy /AKA IROCKZ4me
'86 IROC-Z Camaro
"Cogito ergo zoom"

• 355 cid
• AFR heads
• Arizona Speed & Marine hydraulic roller cam w/ AFR hydra-rev kit
• modified SLP runners
• TRW forged pistons/ceramic coated
• fully balanced
• Edelbrock headers/ceramic coated
• SLP cat-back
• Paxton supercharger
• Nitrous Express nitrous oxide

My IROC-Z
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good answers,
platimun plugs are junk.

Try a cold non-resistor plug.
Nippon Denso T20P-U

With aftermarket heads w/flat seat, try
Autolite #51

 

i wish some one would have told me this 2 weeks ago!!! just want to dubble check there is no way i should run them with n2o. now i just bought new set of platimun plugs from o reilly's they are unopened can i take them back or am i out of luck.