Read my plugs, was carbon fouling on 93 pump gas but not on 96 vp?
My motor is pretty close to your build outside of it being a 5.9 running a 770 Street Avenger.
This is a 4 year old NGK GR4 V power which I pulled recently that I consider just about perfect.
The ring being dark on them is normal, but yours being that dark and the center being that light is a clue of a hot plug.
Also notice where the strap color change is on them.
Yours is way down by the ring, vs mine being about the middle of the bend.
(Timing too high)
That’s my opinion anyway. :D
My motor is pretty close to your build outside of it being a 5.9 running a 770 Street Avenger.
This is a 4 year old NGK GR4 V power which I pulled recently that I consider just about perfect.
The ring being dark on them is normal, but yours being that dark and the center being that light is a clue of a hot plug.
Also notice where the strap color change is on them.
Yours is way down by the ring, vs mine being about the middle of the bend.
(Timing too high)
That’s my opinion anyway. :D