falcon5619

Are the folks using these leaving the .55 gap?

Thanks.

birch64

I think there recommending .044 now

http://www.ngksparkplugs.com/part_fi...?engineid=4749



there also was a GM service bulletin going around the forum saying with the new Iridium plugs gap at .040 I believe do a search

lucky131969

Perhaps you should dig a little deeper:

http://www.ngksparkplugs.com/tech_su...de=nml#gapping

falcon5619

By the way, the car is a 02 Z06 with Long Tube headers and Halltech air intake. From searching it appears most use the .55 gap, but wanted to double check.

NSTG8R

i re-gapped to .35

birch64

This is what I DUG UP! http://www.acdelcotechconnect.com/pd..._03D-J-171.pdf

and if you read a little better I stated: "I think there recommending"

You ask ten different people you'll get ten different answers....the tuner that ur taking ur car to told me to gap mine at .035 so if you ask him you may get another opinion.
thats why there's a search option...

jedblanks

I gapped mine at .055, but they came at .060 - .062

Russ K

A TR55 is designed for a .059 gap, and the TR5 is designed for a .039 gap.

Russ Kemp

jbauch357

I gapped at .060 with my NGK TR55's - my 02Z runs strong and happy...

Old Rotor Head

Me too

lucky131969

My point was, it depends on the application and mods. If you went to the link I posted, you'll see NGK is not recommending just .044. The TSB you posted is just fine for a bone stock car.

birch64

thats why I posted do a search....

BlackZ06

That AC Delco bulletin is for an IRIDIUM spark plug ... different animal from the copper NGK55 ... but, your first post was correct ... the NGK site specifies a 0.044 gap for the TR55 in a Corvette 5.7 liter engine.

http://www.ngksparkplugs.com/part_fi...t.asp?mode=nml

falcon5619

Thanks for the feedback guys. Well after searching all the vette forums and LS1tech.com web sites it sounds like a .055-.060 gap on the TR55 is safe so that is what I will aim for.

Thanks.

BlackZ06

Why don't you see what NGK recommends for the gap ... instead of a bunch of folks who have an unknown level of technical expertise to lend to the subject ....

NGK recommends 0.044 why would you NOT go with that ????

jbauch357

it's going to depend on the specific model of LSx and the mods done to the motor. we went into this pretty heavily a while back, as I was asking the same questions...

old thread is here

falcon5619

Agreed, but member Russ K appears to know his stuff. Furthermore, I searched all over the web and I can't find anyone running a .044 gap with the NGK TR55 plugs.

Thanks.

E.C.P

All the ones I have installed along with LT headers and a cold-air intake (Vararam)I have left at the .050 factory setting with great results .I have been doing it this wat since last summer .