C5Natie

Hey guys, just wanted to double check with my fellow techies. Always open to more knowledge.*

On my vortech blown LS3, just went from 9psi to 12 and switched to e85, 700rwhp. Therefore i swapped out the ngk tr6 for br7ef (tr7's). Gapped out the box at .025.

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robz

I think a 7 is the right heat range for your setup but check your plugs to make sure. If you see more than 3 threads darkened then consider colder.

You will likely get many different opinions on gap.

C5Natie

Cool. That's what I figured. I guess after a couple of pulls on the dyno I'll be able to read them and be sure.

MVP'S ZO6

play around with it for sure. You may find that the car likes a smaller gap. If you want to get a good reading (especially at WOT) put new plugs in, make a pull and then check them out. It shouldn't take more than one pull to tell you what you need to know.