spark plugs E3 or bosch
Reply #22 –
I had excellent results with Autolite racing plugs...# AR133 (for HO)...just don't ever run'em below 65* ambient temp(for more than a few days)...will foul O2 sensors and carbon up your EGR nicely(ask me how I know!)...I felt a seat of the pants improvement in the summer months though, before I sent the O2's and EGR to hell.
NEVER BOSCH in a 5.0...I can't tell you why 5.0's and 5.8's don't like'em, but they just don't...lol.
Good luck,
Don