ok so I have a 5.3 with flat tops and my cam is 228/230 .585/.585 lift 112. And I run a new Demon 625 carb. So what plug should I be running. I searched but I couldn't find my set up. Any help would be awesome, Thank you.
Bill g

 

tr6 is what I use, or some factory plugs witch ever is available

 

Thank you LS7colorado

 

I would try tr55 first. You have to be making a lot of power na to need a TR6.

 

haha your right!! I have tr55 in my 6.0 I had Tr6 on my mind for a turbo build

I also have ran stock plugs with great sucess

 

TR55 @ .050 seems to work great for most NA LS engines.