any one know what plugs to run for a 1989 iroc 350 5.7 with a 125 shot of nos i want to go 2 steps colder then stock but dont know the part # any one by chance know?

 

Factory plug is an R45ts, go to an R43ts that is two steps colder. I only know the AC Delco numbers off hand.

If you get another brand run standard copper plugs, DO NOT RUN PLATINUMS

 

kk thanks a lot

 

im just trying to learn nitrous and im wondering why would you not want to use platinum plugs?

 

Nitrous Oxide Injection1. Try to avoid platinum (particularly double platinum) plugs. There are suggestions that a chemical reaction may occur and some unusual deposits will form on the electrodes - these may impede ignition performance. Double platinum plugs (where a platinum 'chip' is welded into the ground electrode) may be at risk from the platinum chip becoming detached in extreme temperatures, the surrounding electrode material will doubtless have a lower melting point. A platinum chip dropping into the combustion chamber could be disastrous.

This is a pretty good link for info about spark plug choice when running nitrous.

http://www.spark-plugs.co.uk/pages/t...park-plugs.htm