Re: Best Spark Plug for 4.7?
I was told to only use stock copper core. I didnt use OEM, Autozone didnt carry them but I used autolite copper core which are the same thing and it works perfect.
2005 WK Laredo 4.7 28x.
PAID OFF. :D
Installed: K&N Intake, Magnaflow 18", 245/65/17 Bridgestone Dueler A/T's, Shorty Antenna.
Coming soon: 180 degree thermostat, superchip
Future mods: SRT8 wheels, MyGIG or REC, HID's, Painted door trim and door handles.