ok, i've done a little research and i can only find plug information about gsr's

i just recieved a set of NGK Iridium IX's
they are zfr5fix-11 stock #2477

my question is are these plugs good for a turbo LS or are there better ones that i can buy. or should i not even waste the money and just use these NGK ones i have

 

are you boosted?

 

yes revhard kit for the b18b

 

I do not recommend that you use that heat range plug and you don't want to use a
projected tip plug. Here are the iridiums u want to use (NGK)

stick with these:

bkr6eix -6418
bkr7eix -2667
bkr8eix -2668
bkr9eix -2669

 

what would be the best for my application

 

it really all depends on how much power you are running thru it? The stock heat range is a #5, for every 75-100 hp increase you want to step down one heat range
so that would be a #6 and so on! you also don't want to run to cold of a plug because they will foul real easy.

So I would go with a #6 maybe a #7 if you are beyond 12psi