ri-vette

what should i be running for spark plugs on my procharger. just read the instructions and says gap at .035 and a step cold plugs and advise? i just put AC delco factory replacement.

bradenW

I use BR7EF's in my built/blown ls7

Chicago1

ditto on my ls1

ri-vette

Are those NGK?

bradenW

Yes.

Chicago1

Yes, and and you also can tell them you need ngk Stock# 3346 same thing

ri-vette

gap them at .35 and these are a step colder?

bradenW

My C6Z is 11:1 427 and makes 874/782 at 6000rpms. Had the same plugs in it since tuning last year.

ri-vette

no i shouldnt use my ac delco #41-962 gapped at .44

Chicago1

2 steps colder

youngrigo

NGK TR6GP right out of the box...

ri-vette

what you have for a set-up?? i gaped my right out of the box and its about .025-.030

i just have a procharger running about 7 psi

youngrigo

Procharger at 10 psi... 625ish rwhp

131mph + in the 1/4 mile
166mph in the 1/2 mile

I just always replace them right out of the box for the last 3 years every 6 month (Im annal and for $25 i feel better to change them before race days)

ri-vette

btw i got the ngk #3346 plug. not the same as yours

MMA FIGHTER2

Ngk tr7

ri-vette

installed the tr7 plugs now i hear a lil backfire on deceleration. is that a sign of rich?

idontknow

ngk tr6's gapped around 27-30 here on my procharged vette at 16psi 750+hp