Truck in my sig is a 5.3L and has about 28K miles on it now. About 16K on the Maggie/mods. It's running strong, but I'm going to pull the plugs to have a look. I'm thinking that if I go to all trouble to pull the old ones out, I ought to put some new ones in. Current plugs are the ones that Gm put in from the factory. Should I go back with the stock plugs or something else? Motor runs about 9 to 10 psi and dynoed +-420 rwhp. Thanks.

 

NGK TR6

from what i hear these are the ones to go with if you have FI or nitrous

 

im currently running the NGK TR6 as well, gapped at .032". They work great, and are cheap

 

OK. What's the difference between the TR6's and the stock plug? Colder? Thanks.

 

Yes colder I think 1/2 to 1 step if I remember right. I just did the same change. Check this thread it is on the second page of this forum.

https://www.performancetrucks.net/fo...d.php?t=385927

Dan

 

Nice reading on Iridium and forced induction....http://www.automedia.com/Iridium/Spa...ht20010101ds/1

 

tr6 will be good

 

So is everybody runnin the Iridium Tr6s or not I see there is alil price difference.