I just finished up my 416 ls3 build. I have TFS 245s, fast102 combo, cam is 257/266 .622 .645, 13 to 1 compression on e85.

I currently have br7efs gapped at 35 in the car cause i am going to run nitrous eventually (car was tuned N/A on these plugs). I don't think i will get to it this year cause season is ending in two months. So should i switch to like a tr6 and open the gap?

Am i losing anything by running the colder plugs even though i am not spraying the car yet?

 

Going to be running a VERY similiar setup, and had the same question, except I will not be spraying. What kind of plug is necessary for 13.5:1 compression on E85