its a high compression stage 2 PP LS6 head, 240/244/112lsa cam, ported F-90/90, 42# injectors and all bolt-ons.

what spark plugs do i need it should put down close to 550rwhp? N/A ONLY MOTOR!

and what gap?

 

i start off with NGK TR6, gapped at .035.

 

i think the TR6 is used in forced induction applications! i could be wrong but get the Tr55 gap it around the .030's

 

TR6 at .035 to .040.

If you want to take a TR55 to that level buy the TR5, it is suited to go lower as it starts at .040 (I think) whereas moving a TR55 down to .030 is too much movement on the plug IMHO. The TR5 is the same as the TR55 (heat range) just smaller gap whereas the TR6 has a different heat range AND smaller gap. With high compression and a lot of HP, your better off with the TR6 according to NGK. I'm running them at .042 with 431hp.

 

ok thanks im going to go with the tr6 right now. ihave used them when i was using no2 so i know what to expect

 

good choice man. its always better to start cold first on a high compression motor, then work your way up in heat range from there if needed.

 

Reviving this one - on the NGK site they list the Z06 as coming with TR6s but gapped at .054? The "stock gap" for the TR6 is listed as .044? So for N/A 11 to 1 compression LS1 at about 400HP to the wheels (465HP at the flywheel) what is the recommended gap?

 

No one???