NGK Copper V-Power LZTR5A-13 Spark Plugs for Extreme Modified 5.7L HEMI's and Highly Modified 6.1L HEMI's.
Big performance in a little package. These NGK V-Power spark plugs offer economical performance for nearly any automotive application, and are the only plugs with NGK's V-Groove technology.
They enhance ignitability, lower the voltage requirement of ignition systems, and have strong anti-fouling characteristics, while improving fuel mileage and acceleration performance.
The V-Power plugs also are highly durable against electrical and chemical wear, making them a long-life replacement plug. Because of the V-Groove, the spark occurs at the edge of the center electrode.
So heat is not absorbed by the electrode itself. This allows the flame kernel to expand quickly and efficiently for a complete burn and great performance.