BAD2BNE

Going to be putting headers on real soon and figure it would be a great time to change plugs...What are the best for performance in an otherwise stock motor? Just bolt on parts so far...
TIA as always. :cheers: :seeya

Xssesive

NGK TR 55's run them at the gap they come .057! Probably should replace wires too!

BAD2BNE

Xssesive: thanks for the reply!...I've thought about that combo for some time..just wanted some reassurance before I bought them :cheers: :yesnod:

thefly

i am going with the TR55 1iX they are different from the 55's in that they can go down to a .40 gap. on my '01 i had kr with the 55's gapped at 55 and then dropped them to .45 based on some recommendations and eliminated the kr. i think on the Z i am going to drop down to a 40 gap and see what happens, but then again i made 370 rwhp with stock plugs after the headers were installed.

BAD2BNE

thefly: :) Pretty strong testimonial there in that graph!!!!! :cheers:
Thanks for the information :yesnod: :seeya

Joe’s Z06

NGK's get my vote as well, I had them in my TA and after I put them in I felt a difference. Im going to put them in the Vette here next month myself.

evil-1

........ :nonod: ...I can't believe you can feel performance from a spark plug unless your existing plugs were going south.....IMHO

embassured

FWIW,
This evening I just finished installing some AC/Delco "Rapid Fire" #12. I replaced my stock plugs with 34K on them. The lumpiness in the idle is now gone and there was a perceived "gain" in the pull during acceleration.

Considering that two of the "pucks" from the stock plugs were gone and the 34K in mileage - I bet that I would have felt an improvement with any plug used. Just thought I would give you another idea.

Good Luck,
Eric

Xssesive

On my 98 Vert all the pucks were gone at 37K! No more spark plugs with pucks for me! Also had to replace wires, was getting some misfires on my buddys Autotap. End result no more misfires and very smooth idle.
:yesnod: